When is he going to post in retaliation? Unless he just ragequit...
He knows you're never going to stop going on about it, so he's saving his hands before he gets carpal tunnel syndrome typing too many internet arguments.
Has it occured to you that perhaps he acts like this because he gets all this attention every time? Maybe he doesn't even realize he's doing it for attention. I personally lose my mind about once a month and go crazy and hate on the people around me, and have to go apologize to them all the next day, and it's probably an attention issue, because I have no life.