I just want a male FRIEND

Your post did not mention natural feelings, it put all guys in the same group whether you were trying to or not. Any guy you come across who acts friendly and then jets when he finds out he can't get in those pants is bad, yes. Some females do this same thing too though as it has happened to me. If you're only talking about those types of guys then at least specify your knowledge of not all guys being like that, also, what is there to complain about? They, just like the females like this, are doing you a favor by leaving and the friends will stay, no big deal. Its a thing because some people have ulterior motives and its something you just brush off and don't worry about. Your story made sense but you're going to have to use words that don't lump everyone together and is clear in your target, not driven by disgust. Try reading over it yourself and see if you can find any indication of "I know all guys aren't like this but some do this", in which I wouldn't have responded like that.