Because people mistake that realism = better, it's the same thing we saw decades back with the hate the Wind Waker got for looking "ugly" and "cartoony" and being "babbyish" for it's artstyle which result in Twilight Princess looking the way it does and most agree in hindsight, the former is more impressive and timeless while the later has aged more (like how Link's "realistic" expressions in Twilight are heavily limited and go into dull surprise territory compared to wide range Toon Link has). In fact most "realistic" games end up looking less impressive in hindsight compared to stylized ones.
And then their is a simple matter of maturity. Honestly so many times I've seen this happen, it's people who are insecure for liking "kiddy" stuff which usually translates to anything stylized, silly or not "realistic". It's the same juvenile mentality that makes some think that having a ton of violence and nudity inheritly better and more "mature" then stories telling deep emotional stories but uses more stylized presentation or snobs who scoff at Sci-Fi and Fantasy for not being "serious" works compared to say historical dramas or romance.
The comic industry is the best example of how bad this mentality can get with the Dark Age of comics where everything became "realistic" (because realism in most of these cases really isn't) with tons of murder, gore, pouches, action after action and art like this:
You might say that's unfair, but after decades of seeing this over and over, from competitive fighting game players demanding only "serious" characters and mainstays like Blanka and Kuna to be cut because their SERIOUS players and want to be taken seriously (seriously I've seen this from even Smash fans who hated Banjo getting added for being to "silly") or characters like Lucky Chloe being hated for being so silly and again, it's hard not to notice that many of those complaining get drawn to characters like like Bryan Fury:
This was something even Katsuhiro Harada himself pointed out in the Lucky Chloe situation.
And the same is true with "realistic" styles in games, I noticed this most back when games like Gears of War were hailed for this and the resulting "
real is brown" overuse in games that became the norm for years after that which again, we mock in hindsight along with the other "realistic" tropes that were norm like the heavy overuse of bloom and camera bobs.