It may be worth it to tell him why you’re blowing him off.
Dear John,
I was really disappointed that things didn’t work out with you. I’d thought you were a really fun guy, and I really enjoyed hanging out with you. Sadly, how you treated me the last few days showed me a side of you that I didn’t know existed, and now I realize that there’s really no way we can be friends.
While I recognize that some people have a problem with alcohol, I also recognize that it’s possible for a healthy person to drink in moderation. I don’t need to defend myself to you, but for this to make sense, you must understand that I drink in moderation.
Even if I had a problem, however, your response to finding out I was drinking was insulting and inappropriate. If you sincerely believed I had a problem, you torpedoed any chance of “helping” me; your insulting, disrespectful behavior certainly torpedoed any chance that I’d enjoy being around you in the future.
Had you apologized for the insult, perhaps we could have mended fences. Instead, you told me to get over it.
Happily, I am over it: while I’m disappointed that you have such a side to your personality, I’m glad I discovered it now. I hope you can work on your problem and show greater respect to people in the future.
Please do not try to contact me again. Show me that much respect.
Best wishes,
MeanOld Lady
(or something like that – I’ve never written a Dear John before).
Might help the dumb bastard out in the future, y’know. He may really not understand how insulting he was, and it may give him pause for thought.
Daniel