[jjeaff]

No, having separate bathrooms is not sexist. Because the term sexism refers to negative issues only. Webster's uses the word "discrimination". Which I assume you are being pedantic and interpreting in a broader context like "discriminating between the colors blue and teal".

But lookup discriminate and it has a few meanings. One of which refers to prejudicial or unfair treatment. That is the definition implied when referring sexist discrimination.

[chrislynch42]

I don't agree. If sexism refers to the negative issues only then what is the word for the positive issues of dividing people up by sex?

[jjeaff]

Gender distinction, gender separation

Every major dictionary specifically uses terms like "prejudice", "discrimination against", "stereotype". There is obviously a consensus that it is referring to negative/unequal treatment.