Nba and mlb are pretty chill, baseball especially since people go there to hang out more than watch the game.
NFL and hockey fans get pretty intense. No flares and shit like that but it’s still a fun and hype atmosphere
Nothing good comes out of that group imo. People can still go and sing at games, in the US there’s great atmosphere at sports events and there’s no such thing as ultras
Personally not a big fan of their atmosphere