I think you are wrong about what sexism is, or what any -ism is. I can make all sorts of observations without falling into an -ism: There aren't many women in tech. I am not sexist. A majority of convicts are minorities. I am not racist. Older people are more likely to be ignorant of new technology. I am not ageist.

Ism's are not about making the observation in the first place, they are about being reluctant to drop your assumptions when you meet an exception.