Not that it's okay, I just have the feeling that you'd be better off not responding.
Primarily because the majority of such comments are written by two sorts of people. Trolls, or Idiots (Or, I suppose to put this in more PC-friendly terms... those with Intelligence deficits).
Both are things which you ought to ignore, either because one wants to derive their jollies out of peoples reactions (And so they want people to respond AKA "Feeding the troll")... and the other group are not the sharpest tools in the shed, so to speak... In either case, you need not waste your time responding.
It's better to spend your time not writing out stuff that will accomplish nothing but waste your time. It would be better spent towards things such as Fapping.