i'm a platinum member as well. the crowd are well behaved, mostly beer drinkers although in the seats closest to the field in the platinum section there is a fair bit of shiraz and chardonnay being drunk by some of the more preppy members.
I find that there is a lot of abuse hurled at the refs in the platinum section. also, make sure you aren't in section 7. I was there last year, there is a kid (17-18 yo) in section 7 who is the world's most annoying sports fan. I rang up when i renewed and asked if he and his dad had renewed (knew their seat number as it was right behind me), i was told they did and i requested a change of seat.....i can tolerate a lot, but this guy was the worst.
if you're a rebels member...be a rebels member and a rebels fan. none of this wear your reds jersey bs. back the team throughout the season. wear your rebels, don't boo the reds, applaud when they do something good, but back the rebels.