Does anyone know if Twitter is being sued for this behavior?
As of 0800, no.
But it is a private org and they can do as they please.
You use their site, you play by their rules..............
"James Damore, the former Google engineer who was fired after distributing a memo questioning the company’s diversity policies, filed a class-action lawsuit Monday claiming that the technology giant discriminates against white men and conservatives."
“Does anyone know if Twitter is being sued for this behavior?”
Sued? What is illegal about it? Twitter is a private company run by leftist assholes. If you use their product, you are subject to their BS. Best recourse: avoid Twitter.
It’s a private company so they can ban whoever they like. Just like JR can ban anyone here.
On the other hand, I think being ethical will dictate Twitter would tell everyone the rules upfront.