The most common mistake I see is people writing or saying "transgendered". You don't "transgender" someone, and you don't get "transgendered". Transgender is an adjective not a verb. So, instead of saying,"a transgendered person," you can say," a transgender person." It's okay to shorten transgender to trans. Trans and transgender are both adjectives, you need to put a noun after is, so you shouldn't say "a trans' or "a transgender". You can say " trans people", "transgender rights", or "transgender women" something like that.
Don't say that someone was "born a boy" or " born a girl". Not only is it insulting, but it's just not accurate. Nobody was born a girl or a boy. They were born with specific genitalia and then assigned a gender based on that. For example, trans women are not men who later became women. They are women who were wrongly assigned a gender when they were young, but they didn't figure it out until later in life.
