If you want to be a good ally, you need to start taking cissexism and transphobia seriously right now. That means getting our goddamn pronouns right and not expecting a cookie for it. That means learning our names. That means not asking invasive questions or telling us how well we “pass.” (Passing generally means “looking cis.” Not all of us want to look like you, thank you very much.) That means deleting the words “tranny” and “shemale” from your vocabulary. That means understanding the immense privilege you have in your legally recognized, socially approved, medically assigned gender.
Asher Bauer, Not Your Mom’s Trans 101
Read the whole thing, it is awesome and important.