OR, whether it's within your ability to lower yourself to his level or not, you could just simply do what I do when someone blasts me.........blast 'em back twice as hard.

The only thing an a-hole understands is a verbal fist in the face.
"Peace through superior firepower", indeed.

It might sound a bit immature to some of the more litigious members here but I guarantee you it gets morons off your back quickly, and it's way faster than waiting for moderators, administrators, etc., to help you with your problem.

While It may not be for everybody, it's my prefered method of "pest control" and it seems to work.

Just a suggestion.