So you would understand if someone did the same thing to you.I would consider them rude, but there is nothing I could do about it; other than refrain from taking to them
I know, you think it is ok when you do if because you don't understand that biology and gender are not the same thing. But I hope at least you can understand that from their point of view you are being rude by insisting in using the pronouns you want to rather than what they would prefer.