Might be some friendly smack talk, but shouldn't hopefully be anything personal or offensive
Idk on the drinking thing and how strongly it is enforced or not but campus police would probably talk to you if they saw you walking around with open bottles I would guess
Seats in the visitor section should be just fine
We don't have a huge tailgating scene but it is growing and getting better, I'm sure most of the people that do it would be very welcoming