Originally Posted by
Sasha99 
Our friendship is good, and I expect it to continue.
You mentioned that after he became sober, he still continued with the defensive, sarcastic responses. Sadly, it does sound like the way a rebellious teen would behave. He also doesn't admit to this rude behavior and takes no responsibility for it. I think, brain damage or not, you may want to reconsider if some of his apparently entrenched behaviors make your friendship good. I'm sure you have friends who speak to you with respect, and that seems to be lacking a lot of the time in this situation.