It's the same widespread thing, not just in XIV but in about any game that promotes similar group associations.

If you're posting this because you're facing one or all of these issues at the present date, I'd suggest just to look for a different FC. It might need a few tries, but eventually you'll end up with one that you'll really enjoy and make great friends.

Usually the best tries are onto FCs that are smaller in numbers, but with active people.