Hey I got no problem if you are gay, and feel the need to closet yourself behind your girlfriend (i.e. "beard") and agree that nobody should feel the need to stay in the closet these days....
See, I'm just fucking with you, but it's annoying. If i kept doing it soon you would get pissed off. You told us here numerous times "I think this guy is gay" even after he assured us he was not, yet tried to make your generalizations about his question "ok" by convincing us you think it's cool if he is. You were one of the first to declare that he was likely gay, starting off this whole prolonged thread, and now try to say you meant no harm, and that you told him it was "cool( but i still think you are gay)"
In fact I didn't say you were hostile, but your responses to the op's question are at least passive - aggressive, and hence he's pissed off. Sure his responses to you have bordered on adolescent I agree, but maybe that is appropriate in an argument of who is gay or not!
Bottom line, calling a straight guy gay, will piss most straight guys off. Especially if you keep arguing why you think he is, despite him assuring you he is straight. And saying something that upsets someone is no less hurtful if you say (paraphrasing here) "I still think he is gay, but I'm not a homophobe and I don't think there is anything wrong with him being so (nor is there anything wrong with me generalizing guys that like to get pegged by a girl as gay - because I'm not a homophobe, support gay marriage and have gay friends and shit)"