Discord has expanded its Hateful Conduct Policy to explicitly include prohibitions against misgendering and deadnaming in a policy update. Accompanying this policy update, Discord has also implemented a comprehensive warning system to enforce these guidelines effectively.
Everybody knows that these claims are bullshit. "1st Amendment rights" is the biggest dog whistle for bigots that they claim whenever their disrespectful conduct has consequences. You don't give a flying fuck about other people's "1st Amendment rights" when it isn't your racist, sexist or transphobic friends. Otherwise you'd be up in arms against book bans, but your kind cheers for them and every other effort to silence people you don't like.