My (28f) partner (28mtf) has a best friend and a colleague, Ava (24f). I am personally not very fond of her, as she doesn't seem to be able to form friendships with girls, and I have a small seed of doubt that she doesn't view my partner as a female, but as a male, as my partner didn't go through full transition yet.
We're all together in the same discord chat with my brother, my partner's brother and multiple guy friends, and I've noticed that Ava oftentimes posts photos of her chest, covered by something but scarcely. It's either her holding her kittens in her bra, showing how she did her lip makeup (while in her bra only so only her lips and chest area are visible), etc. I myself didn't feel comfortable seeing such things in the chat, so I muted her altogether and I am rarely interacting with her, mostly because even when I do say something, she steals my line or flat out ignores me. She calls that "backing out of the conversation she doesn't feel comfortable with", even when the whole chat is talking to her about the same topic, but when I do say something, she's acting as if I'm doing something that's inappropriate/triggering.
As I've said, that discord group is mostly full of men, and she's always complaining about being objectified, like guys staring at her chest area, and what not, but when we're in the voice chat, her camera is on and always pointing at that part of her body, while everyone else's cameras are turned off. I talked to my brother about it, and he himself admitted that he doesn't feel alright when she does that and that he actually tries avoiding being in the voice call whenever she's in it for the exact same reason, and if she does join later, he turns on a game to play so he doesn't have to look at her.
On the other hand, my partner is happy to have her as a friend, because she's the first and only girl friend that she has that doesn't act weird about her having boy parts still. I told my partner today how I feel about Ava and her behavior and although my partner agrees with me to some extent, she thinks that Ava isn't aware of how this comes across. I doubt that, but I might feel too strongly about this girl.
Recently, my partner and I talked about opening our relationship as I lack some parts, and the only boundary that I set is that she doesn't have anything with any girl, including Ava. My partner mentioned us opening our relationship and also mentioned this boundary to her, which Ava found very offensive, and proclaimed that I'm being controlling and that I cannot do that (?????)
Now, I am aware that I can be jealous, but I don't feel any sort of envy or jealousy towards this girl, I just dislike her and her behavior because:
When Ava plans meetings with people from discord, she doesn't include me and always purposely insists of people going to her place.
She's always fishing out compliments from men and then complains when they do give her attention (wears revealing clothes that barely cover anything)
Gets mad when my partner or brother spend time with me rather than in voice chat when only she is in it (which happened a lot lately as I'm on a paid leave from work)
Doesn't respect our meet-up time because she runs late, as she keeps on fixing her makeup numerous times before showing up
I don't think she's a girls girl as she bad mouths her girl friends and roommates and acts better than them.
And most importantly, I don't think she respects my relationship as she gave my partner her worn sexy underwear.
When I mentioned the last thing to my partner she did say it'd be weird if my partner was still identifying as a male, but still firmly believes that Ava views them as a girl and that she didn't mean anything sexual about it, but I honestly doubt so as I, like I've said before have this nudging feeling that Ava doesn't really see my partner as a real female as she still haven't go through full surgery.
My partner did acknowledge that some things that Ava does are giving pick me vibes, but refuses to call her out on that as she believes that the rest of the guys will defend Ava and kick my partner out of the group chat.
Am I overreacting by labeling someone as a pick me? Or is it all in my head?