I believe there's been a lot of controversy regarding the art posted on here that's of poor quality.
Not every single piece of art that's posted will be a masterpiece, but when it comes to users judging the lesser quality works, people seem to get quite defensive. Some users have even been banned because of their opinions on bad works of art.
It's understandable people wouldn't appreciate bad criticism and insults against a work, regardless of its quality.
But what you have to understand is there are always going to be people who will say that type of stuff. Even as I write this, users are insulting artists and the drawings they've made.
You can't ban them all.
Updated by SnowWolf