You know how on Twitter you feel you have to clap back at every troll? Well, you don't need to do that here. Mute/block and report. They won't be here long. Don't harsh your Zen.
@LiberalLibrarian I always remember the quote from comedian Mike Birbiglia:
"What I should have said....was NOTHING"
Cool off, wait, and usually you'll find you don't care.