Yep. From all the sports I played growing up to the sports my kids played growing up, you never went into another team’s bench, dugout, tent. Especially, at the older ages. There would be exceptions for family, maybe, but that was it.
Between middle school, high school, and college wrestling, then judo, and then BJJ I would estimate I've attended something like 200 competition events.
Every team has their own area where they put their stuff. Their food, extra clothes, electronics, etc.
You don't go in another team's space unless you're invited or you're very friendly with someone on the team.
This is common fucking sense.