The unfortunate fact is that it is human nature to think people who are different from you are weird. Some people embrace diversity while others shun it. Most are somewhere in the middle.

Have you ever gone to lunch where they go? Maybe they are thinking... "why doesn't this guy like us? He always eats alone." Just go with them to their "fancy joint" once and see how it goes. It is possible that once you reach out to them you will discover they aren't so different... well, maybe at least one of them isn't. But someone needs to be the first to climb the wall. You may find that one of your coworkers fits in by hiding the fact that he also likes "regular" things and was just waiting for another person to relate to. Or they might just turn you on to their artsy interests in some way you never saw before.

If we define people based on what we *think* they are, that prophecy will often be fulfilled. You think they do not like you so you isolate yourself. They, in turn, react negatively to your isolation and ignore you. You see this reaction as proof that your original prediction was correct after all.