My partner refused to eat pork when we first, largely as a result of believing the animals aren't clean (ie he was grossed out about the fact that a pig will eat anything ). However, I've got him away from the idea. I think it arose as a child - he was in boarding school from elementary so little parent oversight. Pork can be some of the leanest meat you can eat (and also unhealthiest). Whilst growing up, like probably most, if I didn't eat what was on the table I didn't eat. In retrospect I have little understanding for that policy but I was never allowed to dictate what anyone ate (full understanding). Why a child should be given that power, I do not fathom.
If there're issues eating pork because it is unclean, I ask anyone who believes that to take one look at overall food intake. Processed burgers are high fat, and can be surprisingly low in meat. Regular processed food is full of garbage nutrients and addititives. I'd argue if there're are objections to animal welfare, well then good luck, plenty of examples of chicken farms across UK and Norway being "free range" whilst in reality no better than caged (ie no room to move around). I am fairly sure this is not an unique anti-EU axis of farming ;-).