I don't call them stupid, or even imply it. I tell them what is good for balance, and that is all. If they do not listen to me, I explain my position further. I make no personal attacks. I wish I could say the same for you.
It's a homebrew forum. If you post a class, and especially if you post a class with a PEACH tag after it, you have to expect criticism. If you want me to blindly praise everything with useless posts like "this is cool" and "I'll use this in my campaign" then I'm sorry, I can't oblige you. I work to make things more balanced.