In a further demonstration of his intellectual bankruptcy, Twitter owner Elon Musk has declared that both ‘cis’ and ‘cisgender’ are now considered to be slurs on the social media platform. Use of the terms by users could lead to account suspension.
The designation of the terms as slurs appears to have been a reactionary move following complaints made by some people who objected to being described as cisgender.
The term cisgender refers to people whose gender identity aligns with the one assigned at birth. Transgender, on the other hand, is the opposite and refers to people whose gender does not match their assigned sex.
People who refer to themselves as gender-critical or could be described as anti-trans or TERFs seem to object to the use of the term cisgender because it effectively validates the existence of trans people.