Whoever told you this has no idea what they’re talking about.

The bulk of criticism artists face for their work doesn’t come from other artists; if anything it’s the other way around. Artists are the ones consistently trying to avoid attacking other artists’ works, which is actually a problem because they end up giving wormy defenses of things that don’t need nor deserve to be defended. When artists finally do end up pushing back on other artists’ it invariably ends up being done in a pathetic way where they have to weave in empty praises of the artist and their work even if they don’t deserve it or believe their own words to avoid looking like they’re “attacking” them. They’ll do this even if the artist has been dead for god knows how long.

Artists, more than anyone else, seem to be allergic to giving good criticism because they’re trying to avoid controversy themselves. I’ve found it to be extremely frustrating how cowardly and reserved they often are in their critiques whenever those critiques arise, in fact. There’s always some excuse for why X isn’t as bad as people are saying, or Y probably isn’t a bad person, etc. The only time an exception seems to be made is when the creator is sufficiently controversial that they can be openly and viciously attacked because they’re no longer popular. J. K. Rowling is a perfect example of this: almost nobody was willing to critique how terrible the Harry Potter series is until she outed herself as a transphobic Nazi and lost half of her fandom overnight in the process. Even still you’ll find some artists defending HP anyway not because they agree with Rowling but because it’s still a popular setting and they’re scared of alienating people who enjoy it.

Meanwhile quite literally the biggest example of art critique in the modern day is the conservative crusade against art trying to erase progressive storytelling, which is most definitely not coming from artists critiquing other artists but from political agitators trying to influence public opinion and foster censorship.