Cisgender is banned on twitter ? That's hilarious.
I believe the threshold is 35,000 followers, but don't quote me on that.
Musk gives no shit to free speech, it's just a rhetorical argument, which isn't unheard of: https://i.redd.it/3b470c0htra61.jpg (note that I'm obviously not comparing Musk to Hitler here…)
i imagine the confusion here is that you're making the case that cisgender is not a slur