Naturally haters hate winners.
It goes with the territory.
I was just talking to my dad today actually, after that $#@!ty loss against LA, being a Steeler fan is pretty easy to take for granted. Hell, how many superbowls have we won? Competitive every year? Imaging being a stains fan. This loss against LA, it's one in what, every year or two? For Browns fans it's pretty much most of the season when they're actually in the game and not being blown out.
So yeah, I get why some folks hate the Steelers.
It's not a bad feeling too fwiw