I’m sure there are, especially if they’re particularly bad cooks, but insist on bringing food anyway.Are there actually people out in the world actually would ban people from this sort of thing for not being able to cook well?! That's...so rude I am actually getting worked up imagining it.
I mean, most stuff, you could take or leave. But some dishes are contagiously un-appetizing, and might ruin appetites. Bad/unusual smells would top that list. Beyond that, some dishes can be visually repulsive.