I'm aware of the opinion comment block but it's only available if the QA is anonymous. I hate it when I give my my opinion and people try to argue with me, be rude, act offended, or make me look stupid through the comments. I'm not used to arguing with strangers over the internet, to be honest, I never wanted to go through an argument over the internet. Now that I joined this site, things like that easily happened, thus, I kind of regret why I joined. I wish there was a feature that lets us choose if we want comments in our opinion or not. Don't get me wrong, I'm not saying to get rid of opinion comments entirely, what I mean is you have the option if you want comments in your opinion or not.
If some one says something that I feel I can't answer or respond to without instigating an argument I just leave it alone. No comment at all and let them stew. Those people are hoping for a response and by not giving one you win :-)