I'm annoyed by the Romanian guy next door.
Why does he annoy you?
I've known him for years, but he never talks to me. Must be some Romanian thing.
You shouldn't judge people based on their ethnicity. It sells them short.
I just want to get along with him, I don't understand why he won't talk to me?
Sometimes people just don't feel like talking.  It's common for shy people.  Just let it go and stop worrying about it.