g'day Bob,
I know I'm coming to the party a bit late, but FWIW, the absolute best way to handle morons like that is to simply ignore them - NEVER let them know they got a hit.

Rather, if the post is offensive enough then report it to a mod with the request to have it removed, but never respond - that just adds fuel to the fire.

You are one of natures gentlemen sir, please do as your conscience dictates. But if you want a win, stick around and make the moron become frustrated.

--=-- My credo: If it's worth doing, it's worth overdoing - just ask my missus, she'll tell ya laugh --=--
You're only paranoid if you're wrong!