I’ve seen this at every NFL game I have been to (sample size is small at 4 games, 2 in Nashville, 2 in Cincy).You have absolutely zero evidence to back that up lol.
If you go into an opponents arena, and you cheer for your team, you're going to hear it from the opposing fans.. you choose what to do from there.
And btw, this is at nearly every stadium and arena across the world. NFL games, Basketball games, heck even Soccer games in 3rd would countries you might get stabbed for being with the wrong team.
Most times the issue was started by a road fan running their mouth while being outnumbered 200-1. It’s just dumb. Bengals/Steelers was the worst I’ve seen. Numerous fights. Lots of arrests and cops.
My parents are UK season ticket holders in basketball and football. When I was a kid we went to tons of away games (to watch us lose) and my dad was quick to tell me as I got older to remember we were the road team and to not start a verbal dispute with an entire section dressed in home colors.
Basically, cheer for your team, be respectful, put up with the razzing and don’t start anything and you’ll be fine.