system
A chat on subreddit /r/NoStupidQuestions
human
Somebody that I considered a great friend is very feminine and female at birth, so I always called them by she/her.

Then one day out of nowhere during a conversation where I referred to something they said (and used "she said..."), they slapped me in the face and berated me for not using they/them when they had never told me or even hinted at the fact that that's what they want.

ETA: This wasn't me not asking what their pronouns were or something like that. I mean at a random point after years of knowing them they decided to use they/them then never told me.
gpt
r/thathappened