With it being

Sharma's brand of humour has also come under criticism in the past, with it being panned as lowbrow and misogynistic by some -- he constantly made fun of members of the audience, his on-screen wife Sumona Chakravarti's bee-stung lips and her on-screen father.
https://m.rediff.com/movies/report/is-kapil-sharma-having-trouble-handling-success/20170411.htm
With -preposition
It- pronoun- refering to his "brand of humor"
Being panned- passive "being"
It seems that whole prepositional phrase functioning adverbially answer the question "why"?

Why can't we say "is panned" instead of "being panned"?
Thanks