Please RT 1/
If you don't know their name, ask yourself why you need to refer to their body before knowing who they are. This is important. 2/
It's for them to decide, not you. They are the author of the dictionary that defines them*
Don't know their name? See 2/.
(* I stole this from Zadie Smith)
It suggests I have less innate power and value than a 'big person' and I don't believe I do (although society tries to make me believe it). See 7/
The media is besotted with this power disparity: "little people, big world", "small person, big dreams", etc. Blah, blah, blah. It's nauseating.
If you feel uncomfortable calling out your friends using the m-word, well think about how *we* feel when we hear it in conversations, when strangers shout it at us.
Don't assume, don't generalise, ask 1/ & 2/. Personally, I think it's better to use the wrong term ignorantly but respectfully than the right term maliciously.
Intentions are everything. If in doubt, start with 1/.