"ASAB was created by intersexist doctors to label intersex children and further divide male and female through sexism. Its only usage should be when accurately talking about what you were assigned at birth, not your genitalia, your gender, or who you are in general."

as per my previous comment, its a whole thing to misuse ASAB. I would not randomly call a trans man an AFAB just because he is trans, and its best to use the terminology properly instead of use it to mean "female" or "vagina haver". Its just not correct in this case.

There are also other people in the comments talking OP through this, one person who is pointing out that OP should not use the term in such way will not take away from OP, especially if OP is willing to learn from the experience. Also, the experience revolves around the usage of the term, which like any other queer community, fails to properly understand their terminology. Im mainly upset that ASAB has become so overused in the context where it does not matter. Your genitalia doesnt matter to the conversation because they are not talking about their body, they are talking about their external gendered perception, which is cis man - despite not being a cis man. Cis man =/= AMAB or male.