It irks me that critics get such a bad rep a lot of the time that many artists are instantly put on the defensive no matter the form the critiques come in, since they are already expecting to be attacked. What ends up happening is the artist attacks right back, or ignores even the good advice because they are afraid of being told that something they are proud of isn't perfect.
Now, not all artists do this of course, but it makes it difficult for someone who genuinely wants to help to be able to do so if the artist is already blocking out any valuable critiques along with the bad ones.
This is entirely because the amount of negative critiques drowns out the few positive ones. It can become daunting and difficult to even separate the good from the bad at times.
That being said, I think that if you are posting anything on the internet, you should expect criticism. If you don't want criticism, then don't post it. I know it sucks to post something you are proud of on a social media platform and getting those comments that point out something that needs improvement. But I also think that's incredibly valuable. The best way to learn is from those around you. The internet has made is so much easier to gain this knowledge and to learn from mistakes.
There's no way to completely get rid of negative criticism, but your reaction to it is what truly matters. Be able to separate the good from the bad. There will always be bad critiques that will get to you, but it's important not to give up and to prove to them that you can improve and grow. Utilize the good critiques and be motivated to prove the bad critiques wrong.
Simple comment critiques are good, but it's also a great idea to seek out professional critics. Some are good, some are bad. Just do your research and find the ones that you believe would help you in prove the most. Sometimes it's wise to suck it up and take the more negative critiques if you think that critic has the most to offer in terms of future growth.
There are positive critics out there though. You just have to dig around and ask others and see who they would recommend.
Hopefully this helped a little. I apologise for the wordy response. 
All the best,
Wintre