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Genuine answer: I'm specifically speaking to how men and women are treated as a matter of law.

Laws should not differentiate between men, women, sexual orientation or identity, sexual preferences, kinks, lifestyles, etc.

If a thing is illegal, it should be illegal for everyone, or noone. In this case, the law says that it is legal to go topless unless you are a woman. It specifically cites, as a rule of law, that women are to be treated differently on purpose. That, by definition, is sexist.

Almost all of the other examples you provided are matters of social norms, comforts, and tropes. Nothing else you mentioned has the same weight as the rule of law.

Women have different clothing and different clothing styles than men, they're shaped differently so we make clothes that fit the female form better, just like we have clothes that fit the male form better.

Different washrooms, I disagree with; we should have gender neutral bathrooms and put all this transphobia bullshit about what bathroom people use, to bed. Bluntly: the bathroom isn't a social gathering, people generally are not walking around unclothed or partially clothed in the common areas of even a gendered bathroom. You go in there to resolve your bodily needs to expel waste. Get in, do what you need to do, and get out. With a little more effort in isolating stalls, an ungendered bathroom is the best option. You don't have a "men's" and "women's" bathroom at home... They don't pointlessly gender bathrooms in planes or busses, among many other places, so making bathrooms that are meant for larger groups in public spaces, gendered, does not really logically make any sense at all.

There's a ton more I could say about this or many other things but simply: I feel like I've addressed your question.

Let me know if you need any further clarifications.