Of course they're different, but they've been on a boat for weeks on end with nothing but foul-tasting but clear water and rations and they don't even want a free drink? Even Hai's got to be curious about what drinking alcohol feels like, if he doesn't already know.

Edit: And what kind of warrior orc doesn't like alcohol? Does Grom have some dark history where he went on a drunk rampage after a pint of mead? Otherwise the stuff has got to be pretty compelling to a guy who gets foul looks from humans and elves all the time.