I don't know. The fans of a few other teams irritate me. I have always disliked the 49ers going back to the 80s for whatever reason. I even rooted for the Dallas Cowboys against them in the '90s (yeah, I know, I don't hate the Cowboys even though their fans are doofuses).
I guess maybe the two teams I dislike the most are the 49ers and the Rams. The Cardinals are sort of annoying. That's probably about it? Oh, I don't like the Packers. Just a soft, whiny team that gets too much love.
We have been gone from the AFCW long enough that I really only dislike the Broncos still. But unlike the Rams and Niners, who have beaten us in key games when we were good, most of my childhood in the '90s was the Broncos beating up a bunch of 6-10 Chris Warren-led teams, so there's nothing like the 2004 NFC Wild Card Game against the Rams to take that dislike up to SUPER-STRONG dislike.