It was wrong and downright tacky of Arya to bring up his past relationship with Minissha, not because she's a woman (what?!) but because
(1) everyone - including celebrities - have a right to privacy and to not divulge everything personal detail of theirs to the public. Arya and Minissha seem to have been together for a short period of time after which they called it off. Most celebs do not publicise those relationships of theirs which are not serious-serious. It seems to have been a choice that these 2 made, and it was wrong of Arya to flout that tacit understanding.
(2) it had absolutely NO PLACE in the topic and was completely irrelevant. Minissha and Arya were not even dating when the alleged phone call happened, so what was the point? I saw it as malicious - a cheap way to bring down the person who had hurt him. And what did Minissha do? She bitched about him behind his back and portrayed him as a calculating person. So all he had to was clarify issues and shut up. The more gracefully he would have done so, the more credibility he would have gained.
What was interesting however that this gave a chance for Arya to understand what he and the others had put Gautam through. A chance that I'm sure, completely flew over his head. Two moments brought this out quite clearly. First, when he said that he is being portrayed in a way that he is not. Second, when he pointed out to Diandra that do only women deserve respect and not men. Exactly, Arya, exactly. Now flashback a bit to the way YOU were harping on about aurat ki izzat. Kuch samjhe?
Arya should consider himself lucky that he still had people who wanted to talk to him and who were relatively sympathetic. He was not forced to touch Minissha's feet, he was not lectured constantly, or given death threats. He was not subjected to constant shrieking.
And in my opinion what Arya did was worse than Gautam's gaali. Everybody swears and they can be forgiven. But I would never forgive Arya if I was in Minissha's place.