Because Beyoncé fans think Britney is untalented and Beyoncé is perfect. Simple as that. It's not just the Britney stans, they're mad at everyone who doesn't like Bey and they think everyone is beneath her it's like.... where is all this heat coming from? They take stanning too seriously and they're always the ones starting mess. Though both sides can be immature at times, the Hive's abrasiveness has distant both bases further apart and it has nothing to do with music or the singers themselves, it's just angry stans.