Deadnaming/misgendering someone is like farting in public.

If you do it on accident and apologize, then it's fine. Easy to forgive.

If you keep doing it "on accident", people will suggest you get that taken care of, seek medical treatment, and ultimately avoid you.

If you pull down your pants, stick your ass in my face and let er rip, you're not being brave. You're being a hostile, dipshit asshole and you're going to catch some hands.