Sorry if this has already been posted, my browser was hijacked several times by a lucky spin ad trying to read through.
Anyway, I recommend an IPA. (I'm actually more if a porter/stout fan but I find picking a strong IPA works best.) You can usually get one in the 7.5-8.5% range so it only takes a few to take the edge off of the conversation.
And if you suddenly realize you made a nasty expression at one of their comments, quickly look down at the bottle and say something to the effect of wow, this beer is really bitter, but my friend swore I had to try it. If you slip several times, mix in "I'd rather just have a Great American Beer" and quickly scan the room for the sponsor of their favorite NASCAR driver.
If they're still talking after that, you might have to improvise a bit on the routine. After a few beers (depending on your tolerance for both beer and BS), say it's really catching up to you and you need to get some rest and politely excuse yourself. If you have a finished the whole six pack (or more) "Danger Will Robinson!" Leave now before you slip completely and share your true feelings. Oh, drink at least a bottle of water, take (or leave out a couple aspirin) for the morning.