I got my first creepy sub about a month ago.. I have pretty much all of my 'art' social media linked to my Tapastic account, which of course is what I want, for people to read my comic and then check out my Tumblr, Twitter, etc...
But someone subbed to my comic, went on all of my social media, liked tons of stuff on every account, then PM'd me on Tumblr telling me that they need an update right away or they'll die.
Understandably (I think?) I got pretty creeped out, and I didn't answer the PM. About 2 weeks later, they PM'd me again, apologizing for demanding an update, saying that my webcomic was the first that they'd read, and they've since heard how rude and mean it is to ask a hardworking artist for updates.
I answered that PM saying it was fine, then they messaged me again saying that they're glad I'm not angry at them because they really like my comic. Which was really cute! XD
When someone on the internet creeps me out, I always try and remind myself that it's possible that they're just an excited little kid or someone who doesn't know much about webcomics/social media.
Although it is still super important to distance yourself from people who creep you out.