I could say similar things about many Bills fans. A large portion of the online fanbase talks about a 15-1 team like they're nothing. I've seen numerous posters say they're not even worried about KC. Allen is clearly superior to Mahomes and "everybody knows it," Bills would've beaten KC easily last year if not for injuries, etc etc. Many predicted a 20+ point win before the divisional game. Can't imagine what those people would be saying if the roles were reversed and it was the Bills with 6 straight AFCC appearances and 3 SB wins.
That said, I think it's silly to generalize a large group of people based on a few loud voices.