Kurt has been very proud and confident from the beginning - and there’s nothing wrong with that! I think the problem is though that he’s sometimes so busy with himself that he doesn’t realize how much his behavior affects others. Kurt’s not very sensitive or empathetic but somehow self-centered.
When Finn was being told that he had to move in with him, Kurt immediately was talking about redecorating the room, totally oblivious of how Finn was feeling at that moment (What 16 year old boy wants to share a room with his step-brother that is crazy in love with him? Finn’s mom is mainly to blame for this, she should’ve known better).
Later when Kurt had turned the room into this hideous chamber with museum-like furniture, he again had done what HE wanted to do without consulting anyone. What he had created was the result of who HE was, completely ignoring Finn’s needs, feelings or interests. Redecorating the room could have been an opportunity for both guys to grow together but Kurt turned it into an act of self-expression. Finn snapped, which he shouldn’t have, but honestly I understand why the situation escalated.
This week’s episode was a big fail. I don’t know what exactly has changed since Glee returned from the break but this is not the show I fell in love with last year. Last week’s episode has been the only good one so far :-/