Today, I overheard my mom talking loudly on a video call to my brother and his wife, catching up and sharing their latest news. Apparently her latest news included the fact that I have been diagnosed with ASD.
The way I respond to this is pretty simple; The people around me know I have little need for conversation. I can talk to people and sometimes enjoy it but I can very well not make conversation with people. Disclosing my secrets or misrepresenting my statements is grounds for no further conversation beyond simple practical utility.
In my experience NTs generally assume there’s not a privacy restriction unless explicitly stated. Even if not the explicit statement further grounds the decision to make minimal conversation should they violate your trust in that way.
she also mentioned that I’ve been less conversational lately, which she attributes to my diagnosis and to me no longer wanting to make the effort necessary to talk to neurotypical people
You were recently diagnosed with a second condition that affects your willingness to converse. She already knows you have one and that it’s been significantly affecting you lately. Does she know how autism affects interpersonal interaction? Does she think you’ve developed autism recently? Does she doubt the diagnosis?
I’m also not sure how to move forward with this information in any way without it seeming like I was eavesdropping - which I wasn’t intentionally doing,
I have sensitive hearing and I live in an area where most people don’t have inside voices. If I’m not wearing my headphones or hyperfocusing on something I can hear people trying to be quiet a floor away. I don’t know if you’re the same way but I agree with Cagi, if a conversation was meant to be private it should be conducted where it wouldn’t be overheard. It’d be eavesdropping only if an attempt to do that was made and you had made intentional actions to subvert that effort. Eavesdropping is an intentional act, overhearing is an autonomic act.
but as it is I don’t feel comfortable raising the subject, or noticeably increasing my level of masking (to accomodate her apparent discomfort with me not doing so),
That’s entirely up to you how to deal with it. I try to mask less around people I feel safe around. So far I think it’s going well. Does she scrutinize things that spontaneously start going her way? If not it may just not come up. If so you could be honest about overhearing her or assert that you were trying to think about how she felt about your recent behavior.
I haven’t yet told him, and now I’m worried that he’s going to take it as me no longer socializing with neurotypical family members (even though the arrangement was made before my diagnosis).
You could call him to share the diagnosis and ‘play dumb’ about him already knowing. I don’t know how far just to your brother’s city is but you could offer an alternative get-together for later and explain that last year’s complications have made you want this trip to be simplified.
Unfortunately ‘Creepy’ is subjective and poorly defined. It’s a feeling rather than ‘this meets XYZ criteria and therefore is creepy’.
I agree with you that she’s not using ‘stalking’ correctly but I believe this was meant to terminate your platonic relationship. It’s upsetting but that’s likely the point.
This behavior is much more in-line with a correct usage of ‘stalking’. I would assume this escalation was taken as being fair game from your refusal to accept her use as stalking. That’s vexing but likely meant just to highlight their desire to terminate the relationship as that wasn’t clear from her first accusation.