I generally hate any savoury food mess but I always veto beans in particular. They just make me feel nauseous, which doesn't exactly make for a fun atmosphere.
Anything savoury, particularly if it has cheese in it Also not a fan of using porridge (prefer to eat it) or flour and water, but only because I have a beard and that would be an absolute bugger to wash out
Besides the ones that might seem obvious, shaving cream. I know, it's a super common wam item but like, I'm sensitive and fragile XD It makes my eyes water, it burns my skin, even the "sensitive skin" kind, also the ends of my hair are colored teal and shaving cream would strip that color right out. So I have such an aversion to it, when I'm watching wam videos with shaving cream I have to trick my mind into thinking it's whipped cream or frosting because if I think about it as shaving cream, I just think about how badly my skin burned when I used it lol It's why you'll never find shaving cream in any of my wam stories because I typically don't want to cause my characters actual physical pain, which my brain associates with shaving cream. I don't even shave my legs with shaving cream, I use an electric razor instead because I can't handle it lol