Again, I understand that you do not understand.
Not many people do. Even if they are interfering with your conversation you don't have to give them recognition. Just make up a BS excuse and walk away from the radio. If everyone would do this they would get bored and go away. There's always the dumbbell that thinks he can insult, educate, offend or scare away an agitator. If you want to play his game that's fine but you better expect him to stay around for awhile.
I think a lot of people agitate on SSB for the same reason DXers like to use SSB. It is a more efficient mode and takes less power and antenna to make an impact. Then look at the typical SSB operator. They seem to have a lower tolerance for BS and a lot of 11 meter AM antics will royally piss them off...beeps, echo, off color language. It makes 38 LSB an easy target. I have saw a lot of threads about agitators on SSB but there seem to be few about the AM DX channels.