Yes, knowingly or unknowingly Virat as well as other Chavans fuel Pakhi's behaviour by inflating her ego. She thinks she can get away with anything.
If Sai says anything to Pakhi he jumps the gun but if Pakhi talks way worse to Sai, he stands like a mannequin. I mean he even participated with Pakhi in insulting Sai in front of everyone, last to last episode.
It seems like he doesn't care about his wife's dignity at all. In fact, a person like Samrat who barely knows Sai felt so stung with the way Pakhi and Virat talk to Sai that he stood up for her. Pakhi was blabbering her nonsense and Sai looks expectantly at Virat, meanwhile he was in his own world.
Pakhi knows no one would say anything to her, so she throws out all the ugliness in her heart for Sai out in the open. In the precap, Sai says to Pakhi that why is trying to make Virat jealous? I have an inkling Virat would definitely reprimand Sai for that.
He needs to stand up for the right woman. And it's not even like he doesn't want to disrespect Pakhi in Samrat's absence, he's back already. It's high time he stops Pakhi even if he's angry with Sai.