I'll be honest: I try not to get in the middle of disputes like this. If two adults are involved, I leave it to them to work it out between themselves.
If you'd like to appeal a ban, please send me a link to the page where the discussion happened and I'll be glad to review it for you. With that said, we have a pretty strong policy against harassment and abuse. If he feels like you were threatening him or unduly cursing at him, he is within his rights to block you. If he was rude or insulting, I'll speak to him about that, but I refuse to play moderator in a he-said/she-said debate.
Is that fair?