True enough. And I happen to think that people who are trying to establish that referring to men as "male" and women as "female" are violating the rules of polite society are giant, throbbing dicks. So I'm going to call them out.
I've already agreed with that. And referring to men as "male" and woman as "female" is not violating any social norms, at least not in the United States.
You also claimed that gender is some sort of scientific concept, which is also objectively incorrect.
If someone asks you to call them by "him" and you call them "her" instead, you are just being unnecessarily mean. This is not a hard concept to understand, be polite to others if you don't want to face problems in your personal life and career. Refer to people as they wish to be referred as. Asking you to do that is not "vocal, vicious and vindictive... [people] ...enforc[ing] their own cultural taboos" and quite frankly I find it disturbing you think is it.