eh, don't do anything just yet. think before you leap, and let proper authorities take care of the matter. I'm sure the comment wasn't meant to be anything harmful.
I don't really see the point in starting conflict or drama where it's uncalled for. I do like to get a lulzy laugh off of the really dumbass homophobes on deviantART and rile them up a bit with playful and/or innuendo-laden replies when they try to intimidate me, though I don't tend to get nasty comments very often.