She is asking for self-censorship. Which is de-facto censorship.
Every day, the overwhelming majority of us will exercise self-censorship. Not only would probably none of us use or tolerate the use of the word ‘n***er’ ‘black b@astard’or ‘p@ki’ in speech, we would also not use those words in our private thoughts to describe a person, because we recognise that they are deeply offensive and it would be alien to us to even think of using such words. This has not happened by chance, but because as individuals and collectively as a society we have changed our attitudes about what is acceptable/tolerable. That process of change has been gradual, and initially many of those who objected to those terms would have been seen by others as controlling and wanting to censor people’s freedom of speech and thoughts, but now relatively few people would use such words in speech, and they know that if they do, then others will challenge them.
It is not even acceptable to just be a closet racist and only ‘think’ those words, because to define someone using those terms in your mind means seeing them as less deserving of equal and fair treatment, and and that will inevitably lead to racist behaviour.
Freedom of speech does not mean freedom to have what we say go unchallenged, and challenging sexism, racism etc., and asking others to reconsider what they are doing and to change their behaviour, is not censorship.