"Your comments were full of implicit and explicit signals of condescension towards the people you were talking to."

no source.

“It would only be an "ad hominem" fallacy if I was pretending to attack your argument: if I used an attack on your person in order to undermine your position. But I'm not doing that : I'm attacking your person, in order to have you improve your attitude, regardless of what position you hold.”

“Ad hominem” is Latin for “against the man”. “Ad hominems can simply take the form of abuse: e.g. “don’t listen to him, he’s a jerk”. http://www.criticalthinking.org.uk/unit2/fundamentals/logicalfallacies/adhominem/

Your above argument, is also a circular argument. “Circular arguments are arguments that assume what they’re trying to prove. If the conclusion of an argument is also one of its reasons, then the argument is circular.” http://www.criticalthinking.org.uk/unit2/fundamentals/logicalfallacies/circularity/

So, the reason are trying to improve my attitude, is because of my attitude (which is your conclusion). So if you believe the attitude is there. Then you are fine with this conclusion. But if you don’t… Either way you keep believing exactly what you did before.

My attitude is proportionate to my position; my argument is not disproven. So, if i disprove others argument. It is their position which should change.

You need to get used to abandoning positions which no longer work. Instead of trying to re-enforce a failed position.

“As I'm not an American I really don't have an emotional investment on your government”

I’m not American. I was discussing conspiracies. Why is it you think we have to have an emotional investment in things? It is merely a matter of evidence.