"... or her voice — because it doesn’t yet sound feminine enough — or announcing to the whole room when she needs to 'powder her nose.'"
From a WaPo "Ask Amy" letter from a woman having a problem with her transgender friend. Amy prefers calling the behavior "cartoonish" instead of "offensive" and speculates that she'd use an "exaggerated stereotype" — "I’d channel John Wayne, with notes of Ryan Gosling" — if she wanted to "act like a man"... which seems to miss the point.
Isn't the person transgender because she already feels that she is a woman, not that she needs to act like a woman? So shouldn't she act however she feels? Maybe the answer to the letter writer should just be that your friend, like most human beings, is annoying. Give her the same respect you'd give anyone else who is your friend: Tell her when she's being annoying.