Pigvijay can slap Paaltu Prem, berate Choti Anu, show tashan and do gundagardi at Kothari's house but he became a bheegi billi and stood silently when accused of xyz things by his girlfriend Pamaa's real children Pakhi-Tosu. Why is there no strong response or attitude from him now? 
So Pigvijay clearly knows his priorities quite well and has learnt very quickly from his dogli besharam girlfriend. One set of rules, lectures and thrashings for the rest of the world and special treatment for Anuraj ke Anmol Ratans, who will get a free pass regardless of what they say or do, even if it's the same thing or worse
Also, Shameless Shahs are probably opposing Brainless Banku not because he's a manservant but because he's a manservant to someone who is himself a freeloading tenant in their house. If Banku was the manservant to some rich person, they might have been less opposed as they would have seen him as a convenient way to access said rich person's wealth but here his master Pigvijay has nothing to show for, except for being Pumaa's boyfriend 