Personally, a large part of the enjoyment I derive from coming to football is from the tribal nature of it. I’m more than happy to drink and chat with rival fans before and after the game.
Surely a better solution would have been for the OP and his group to have spent time together before and after the game, but sat in their respective club's area for the match itself?
Literally no sympathy for the OP at all. Bringing away fans into the home end, regardless of whether it is the family stand or not, is a thoroughly daft thing to do - especially given the context of the match and how important it was.