I have no idea why people dislike them either beside the fact that they're such an easy target. There is a racism element but I'd say of the overall hate they get that's in the minority.
It's like Justin Bieber hate. There was no reason to hate that kid when he first debuted (that we knew about at the time) but once the teenage boys got into their feelings and he got megapopular then everybody else followed suit.
While writing this I of course thought of the thing that people do once a thing gets too popular and everyone wants to turn on it and will love to see it fall. This is compounded by the fact that no one really knows what the fukk they do.
And as for Bill Burr, he doesn't fall into the racism category. He falls into the category of people who sees them as just vacuous and doesn't get the point of their fame. But if you listen to his podcast and shyt, it seems like he doesn't really give a shyt about them at the end of the day.