I think they're a relic from a time when it was ok/cool to hate on a band or artist for no reason, publicly, without everyone judging you for being a prick.

My theory is that they're one of, if not the, last bands to fall into the above category, so everyone just uses them as their go-to.

Younger people (in this case meaning people under 35 lol) are just so much more accepting and less judgemental than previous generations. And you love to see it.