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Misgendering someone is transphobic in exactly the same way that calling them the n-word is racist. It means you are prejudiced against that person for what makes them different — in this case it just sounds like you believe trans people don’t exist or are mentally ill members of their birth gender.

You're taking the piss here, right?

Misgendering someone is in no way the same as calling a black person the n-word lol. It would be more like calling them a "tranny" is the closest equivalent, though no equivalent to the n-word exists.

Misgendering is, at worst, rude. That's assuming that they have told you their "pronouns" in the first place, and you chose not to use them. Rude, but in no way equivalent to calling a black person the n-word. It doesn't mean you're "prejudiced" against that person, it just means you either don't play along with coerced speech or their ideology, or you just don't care.