A critic will look at a piece of work they don’t like and pass comment, then pose a potential solution.
A whiner will look at a piece of work they don’t like, then burst into tears, shrieking about how the artist has specifically set out to offend them, and never actually says anything constructive. Like this;

"Personally, I find your work to show an extreme lack of originality and taste.

It makes me extremely upset to see you getting so much attention with your soft-core furry smut but that's what your watchers want, so whatever!

Your drawings remind me of women on steroids, unattractive and unnatural.

You're a comic artist who really can't grasp any good concepts to get attention so instead draws furries with their boobs popping out. HOW ORIGINAL! : D

Oh, and lol, how almost every one of your 'stories' involves girls (of numerous animal types, but, you know, no connection to bestiality ) grow huge boobs for no reason.

I wish you would please, as the one and only favor I will ever as you to do for me, please please just quit drawing.

Thank you."

I will, of course, set all of my drawing equipment on fire, quit my job as an illustrator, shred all of my paper and head off to live in a yurt with no internet access IMMEDIATELY!