It's not "misgendering", it's 'correctly observing the sex of'. It's kind of the core of our political concerns. How can we possibly discuss these issues if we're forced to use the very sex-obscuring language that we object to, because it erases our biological experiences, class, and the experiences that stem from them?

Agreeing that "misgendering" and "deadnaming" are rude has led to things like pedophiles being able to disappear their past, the media reporting male criminals as female, and rape victims being forced to refer to the man who raped them as "she" in court.

Agreeing to use the preferred pronouns of some people and not others because we dis/approve of them is bullshit. We're naming reality, because we have to, otherwise we've lost our argument and the right to speak before we even begin, not rewarding certain people we like by conceding to their delusions because we don't want to hurt their feelings. Their feeling are their own responsibility, and if they go against material reality then they are not being reasonable if they expect everyone else to pretend that material reality doesn't exist. Especially when they try to make the observance of it illegal, or there are consequences like ostracization/doxxing/losing your job. Then it becomes even more important to name the truth, in order to fight that happening.