I am 90 minutes away from the Ohio and Indiana casinos rooms, so most of my play is home games, mostly cash. I host my own weekly group and attend other games occasionally. I have found that rules and structure are very close most of the time , but each game usually has something or a few somethings that vary as to structure or group dynamics. If you are stuck with this ( as I am) it is best to simply go with the flow and not openly object too much. Either don't attend or adapt. I would rather play.
I have also found that if you are not "that guy" about stuff and go out of your way to fit in to how they do things, your status as an outsider will fade. Soon enough you will be part of the group talking about other "outsiders". Good luck.