If you're a hiring manager and can't even be bothered to know the most basic facts about me and that I might not like that piece or pork or salmon
for religious or ethical reasons then that about says it all.
If you are a hiring manager and you are attempting to learn someone's religious or dietary beliefs prior to hiring then then you should be sued/fired.
And yes when I've taken my candidates for lunch as part of recruiting I always ask for any dietary preferences so i can find a place that accommodates. It's just commonsense.