There is no universal “AFAB experience”, especially in relation to being trans. A trans man and a cis woman are both AFAB, but their experiences in relation to that fact are wildly different. I also don’t conflate assigned sex at birth with experience (to a large degree) and personality (to no degree at all). I think, depending on how you transition, this is less so about identifying with being “AFAB” and more so about identifying with transmasculine (if you identify with that term), but I’m not one to speak on your experience and how that manifests for you, so correct me if I’m wrong.
And that’s the problem. It’s not universal, and at the end of the day, that’s why it differs for me. Something that someone can tie to “AFAB socialization” could easily apply to AMAB people in a lot of instances, for example. My main issue with the “AFAB/AMAB” shit is that it’s used to create a new binary, and enables people to misgender non-binary people because they see non-binary as “cis+” or something like that. As a non-binary person who explicitly wants nothing to do with the notion that I could be cis, this is what gets me the most. I assume bad faith in a lot of people, so anyone who asks me “AMAB or AFAB? I just want to know your socialization!”, yeah I don’t trust them either.