I know I have annoyed him several times, but he has started to accuse me of things I didn't even do. That is just sad. I don't know what causes him to come back and be like that, but all he has to do is stop that kind of abuse and things can go on like they did before. Perhaps he has no choice. Maybe it is just something he feels he just has to do.
Flames and abuse have been with us since before the Internet. It happened on bulletin boards back in the day as well.
I seriously doubt that it will ever go away. It is just a part of the way the world works now.