Yep, offering suggestions on how to improve your pictures is antagonistic...
There's something to be said for being gracious when help is offered, even if you cannot apply the suggestions. Being a dick about it with comments like "I'm not a professional photographer" is rude and antagonistic (just as it is when you act this way with people trying to give you the real scoop on your legal issues). I really don't think it's a coincidence that you actually made a thread for people that dislike you when you act like an obnoxious little know-it-all and don't have kind things to say about other posters.
It's fine to disagree. It's NOT okay to act the way you do when you do disagree.