>>86008810He's black, so people feel obligated to hate him to an extreme, though, of course, some of the hate is probably exaggerated for laughs, but still.
I think some people actually think he's there solely because of "forced diversity".
His gag with Lori can honestly get annoying, so people get validated to hate him, to an extent.
People who only or mainly watch the show for the girls are going to get annoyed that he "hogs the screen-time", despite him being the main character's best friend, and not really having any or many episodes actually centered around him.
Just to note, I don't even like him that much. I like the idea around his character, and he was enjoyable in some episodes, but that Lori thing really comes back to bite him and was only amusing, maybe, 2 times. It's like Brock, from Pokemon, it gets ruined bythe fact that Lori is already in a relationship with a nice guy, and Lori is, like, 6 years older than him.