No. It is changing the subject. Your logic makes no sense.
I changed the subject from size to race like he switched the subject from gender to size to show to that, for the same reason that separating black and white fighters would be racist, separating men and women fighters is sexist. Women are being treated differently based solely on the fact that they are women.
Do you see having seperate male and female toilets on public places sexist? What about clothes shops for men or for women? how about Women only gyms or men only barbers? Is that sexist?