I'd like to just give support to all hunters on a situation I know we all deal with on the internet.
Every post I put (with exception to this site) gets some kind of hate post on it. I get everything from religion posts, to how hunters are nazi's, to an actual logic response showing criticism.
I just want to ask that you not response in the same tone. Come in even and knowledgable and enlighten them with the criticallity of hunting. Tell them how hunters are the drive for conservation, we prevent over grazing, we keep populations stable, we care for the animals, etc.
It absolutely kills them when we show them up. In most cases, I have actually come to realize they are responding on first reaction. When you come with a knowledgable answer, it can even persuade them into realizing hunting is positive. It's not necessarily that they're bad people, they're just ignorant to the process and positives.
So keep it straight, simple and knowledgable is my best advice. We'll always battle our rights to hunt, but by doing so in a proffessional matter, we can get an upper hand.