I post my photos on here because I want to learn. I have an open mind to other's opinions. I post what I think are good pictures, and sometimes others give me bad comments. And sometimes I don't agree with them. But I realise they are entitled to their opinion and I accept it with good grace. I have found people on here are willing to give and accept all comments and are keen and sincere. I don't think anyone has ulterior motives. So accept all comments with good grace and either take onboard or quietly reject as you see fit.
I also think that all artists and photographers know the rules and also know when to break them.