I make it a point to never slam on something that others enjoy reading. I might just say that I didn't enjoy it myself, but I won't slam on it and say that it's poorly written or anything like that.
I am one of these TwiFreaks...and quite proud of it actually. But I find no need to defend my tastes to someone else. Different strokes for different folks...I couldn't stand Buffy the Vampire Slayer personally...
OP...my DH said that he will be partaking of his own Anti-Twilight meet on board too...but he'll probably do it from the balcony of our stateroom! Peace and quiet and no wife to nag him for a little while...