People have all kinds of reasons they "hate on" certain fighters and the same goes for people liking certain fighters.
I'm not very big on GSP. He is absolutely one of the GOATs and I have immense respect for the guy the way he completely shuts fighters down. You know exactly what he is going to do and still does it. But, I find his fights kinda boring and find myself rooting against him, not because I hate the guy, but I want the other fighter to do something exciting (EVERYONE jumped out of their seats when Carlos dropped him and that is honestly the most excitement that any of his fights have given me lately tbh).
I really like watching Anderson fight because he is exciting. He does things that are fundamentally awful, like leaving your hands at his waist, but has some spectacular KO's and gifs all over the place.
To each their own. To outright hate someone you have never met and actually don't know is stupid and only on an internet forum you find shit like this.
#18 Kyle Busch
#11 Denny Hamlin
"Man, this whiskey is GREAT! What is it called?"
"Its called rum"...