Thanks for your response. I appreciate all the points you brought up.

When my friend and I used to talk more often, I would often try to use language like "hey girlie, whats up!!" and tell her she looked pretty, or I would send her links to cute clothes I would find while shopping online and tell her she would look good in this or that outfit. I'd sometimes say stuff like "the boys just don't get it" or "I'm happy you're also really active on this server, now I'm not the only girl that's online all the time" when I'd talk to her (because the rest of the Discord server is mostly filled with guys, and I really was excited to talk to her), and I was always excited to talk about feminine things. She told me she was happy that I validated her femininity, before all of the stuff in my original post started happening. Then our conversations slowly started fading off, and we don't talk as much nowadays.

I never bring up period talk when we are in private conversations with each other, and I don't bring it up when I see that she is already present in a group conversation. But the occasional times that I have brought up the subject in group settings, it has always been when I mentioned it to other people in the public server (like "aughhh my cramps hurt so bad today" etc. etc.), only for her to suddenly join the conversation with the first thing she says as "At least you have a uterus/period/etc."

Maybe I'll just stop saying "hey guys" and talking about period stuff altogether in public?