It is not a question of separate treatment for guys vs girls either. If Andy is allowed to shove gent's underwear into Elli's face and Gauhar does not protest at that, she can't protest when Andy pushes Gauhar's own underwear in her face.
As to clean vs dirty underwear, neither Asif nor Elli knew if that underwear was clean or not. In fact, from what was shown, Andy went much further with Asif, pushing the underwear into his mouth. And if a person has to have someone's underwear pushed into his face, I am sure people would prefer that it was their own.
If Gauhar is okay with that treatment for Asif, she cannot suddenly claim this kind of behavior is crossing the line when she is given that same treatment. I personally, feel Andy deserved to have been slapped by Asif at the first instance itself, but since Gauhar as 'karya sanchalak' permitted that kind of behavior, of all the people in that house, she cannot complain about it.
She is an utter and total hypocrite, someone who wants to act superior to men as well as hide behind female privilege when it suits her. Kamya also uses the same line of attack.
Elli, however, has displayed consistent behavior throughout. Elli is beautiful from inside as well as outside. These women cannot hold a candle to her.