What do I do when dealing with this person even if you don't think they mean it?

What would you do if you got into an argument with someone because you were supposed to go somewhere and since they were drunk youdecided not to go anymore. They ended up taking it extremely personal. They don’t talk to you in a week because of it meanwhile while they were drunk they were making rude comments to you. The problem is he actually thinks he right to be upset I left. I understand when people are alcoholics they aren’t themselves when drunk. He starts rehab soon. But I still think he owes me an apology and since he thinks he’s right he won’t call me again. I probably won’t speak to him anymore and thinks his reasoning is justified. I reached out to him via email and he wasn’t friendly and basically saying he’s mad and if I err want to hangout again I knwo where he lives. Should I ever call him again? Or just understand this is the way he is? I told him he doesn’t care how I feel and he basically writes I don’t have to explain myself to you. When you make sense get back to me. What’s his problem? What should I do? Meanwhile i’ve done so much for him these past couple months.