Ok, I think I have some suggestions how you can tell someone he or she is an asshole a way that does not hurt:
"I have not much sympathy for you."
"You make me feeling uncomfartable."
"I think you treated me in way that makes me feeling you are disrespecting me."
"I have no right to judge about you as you are just human, but I think your
behaviour makes the impression on me you are a sad human."
"I will stay alone for a while, please can you go out for a while."
... anymore? ---> If there would be an interesting, I would put it into my signature