Just ask if their mom knows they're on the internet without her permission
Just as a general rule: blocking people on any platform is not childish! Sometimes (tbh a lot of the time) the best course of action you can take towards random strangers who make you uncomfortable on the internet is to just get them out of your space, especially if you don't engage first.*
'But they won't know why I blocked them!' Yes they will. 99% of the time (even if they say otherwise) they know what they're doing.
'But won't that make it seem like I'm not brave enough to face them??' A, it doesn't matter; you don't owe anyone 'proof' of your emotional maturity. B, even if you legitimately aren't brave enough to face them, it still doesn't matter. Again, who are you trying to prove yourself to??
'But they'll just come back...' Block them again. In my experience, it takes much more effort to make 10 new accounts just to harrass someone than it takes to block 10 people. You have the advantage.
*As other people have said, ignoring them is the best option: the most important thing to do anywhere is to not give people like that your attention. If you can make it easier on yourself by hiding/reporting the comment so you don't have to see it, definitely do so. Chances are it'll just be a one-time thing anyway.
But in the event that it isn't...see the above.
totally agree with this (and the last paragraph too!). I think blocking makes the comment go away and if that does happen: 1. you don't need to see it. and 2. other people don't need to see it.
If I read something I don't like I don't comment, especially in that manner!. It's too bad other people do this. So sorry it happened to you. Take heart, looks like a lot of people have your back and are willing to stand with you. Keep creating, that's what's really important.
I have not experienced any of that (luckily 
but it'll come probably) some of the things I could think of is being silly with them, or being annoyance to them, ignoring them , or being a "therapist" lol and what I meant by that is talking to them but who wants to do that 
(lol)
But jokes a side I agree with many here who have commented
if you feel like it is bothering you than you should block or delete it , it isn't childish ( well I guess depending on the situation that is) because you are taking action on what makes you feel idk down.
Like what joannekwan has said don't give them that pleasure/satisfaction, it'll most likely be an endless cycle between you and whoever that person was
Summary
(I won't lie I Have experienced something similar in a way that was negative but it wasn't any of my platforms that I have created it was more of talking about a persons ideas 
)
Sorry! I didn't mean it like that.. 
Just I'm not sure if its a troll or someone felt hurt about my comic, and I thought I should either find out why they feel that way or just ignore it.
Nah, if they can't articulate their criticisms in the slightest, then they aren't worth listening to for you to grow as a creator.
I'd slap that little thumbs down button 
real talk though, ignoring is usually my go-to for one-off things (or on platforms that you can spot-remove comments, then sometimes I do that. I've done that one Instagram before). If they continue to harass you over several episodes then blocking is good if available!
Yeah, WT takes hella long to review reported comments. If only they allowed creators to delete comments under their episodes.
It's time to learn blocking is not childish. It's keeping your mental space clean and tidy. Sure you can go ahead and ignore this, until one day you might snap at a random commenter putting down something less than pleasant.
Maintain your social media experience, use that block button and move on.
They can go suck a dick. Not sure if it's an option but just delete it and sometimes blocking them would be best because they can continue to post comments like that again.
Ah it's on webtoon, that makes it all the more annoying because you can't delete it. I'd give them a thumbs down and ignore it, unless they keep commenting this on every episode. Then you could try and report it (and hope webtoon actually listens)
((If it makes you feel better, I dealt with the same thing when I started my first comic on webtoon and it was not fun
They had the chance to explain themselves and they chose to send hate. I honestly don't think a comment like this deserves your attention because there is nothing there to work with. If it said " this is insensitive!! What a garbage comic!!" we could see there is an attempt to point at a flaw.
I don't think all mean comments should be dismissed as hate, some people can't word criticism in a constructive way. But If it just insults you, it is not something you should feed into. In my opinion.
And frankly, I have seen people trashing artist works for a petty disagreement on social media or just because they push others down to make their favorite artist look better. Sometimes is not even about your work.
I hope this person is gone and looking at your comic their attitude looks uncalled for.
They're trying to get a rise out of you and probably actually don't even think your comic is garbage. You can either ignore it, or say something diplomatic that isn't going to be the response they're looking for (i.e. "Sorry you don't like it!"), but honestly ignoring it is probably better because that's exactly what someone like that doesn't want to happen. They wanna drag you into their miserable little world via petty internet fights.
yeah, I once been on a random internet fight on tapas and it just made me feel equally stupid as the person who started it... 
Ignoring them is definitely the way to go. I tried to reason with a troll once aaaaaand... it got even worse -__- so yup, even though it's annoying as hell, it's probably better to ignore. Report them if possible, or just give 'em a thumbs down. Also no, blocking someone is not childish: this person contributed no constructive criticism in any way, shape or form and was just being an ass... nothing wrong in preventing an asshole from ruining your day 
This is the definition of bait. I'm sorry you got a comment like this on your work. I would delete the comment and block them. There's nothing wrong with doing that! I'm an active member on a DC Comics discord and whoo boy, we have to boot people at least every few months for stirring up trouble. We just want to talk about Superman lmao. 
