> it is impossible for transwomen to menstruate, because they are male
I hate to break it to you what you just said is transphobic. You're probably confused and don't believe me, and wish I would produce evidence. I don't want to get too off topic, so I will just say - wouldn't it be really annoying if all I said was "please educate yourself / do your own research"? That was my point.
also nice throwaway lol
My own research tells me that your question cannot be in good faith. Google tells pretty clearly, that menstruation means a different thing with similar aspects. If you had asked that in good faith you would have definitely used the expression “menstruation symptoms”.
Males can't have any type of menstruation though, or symptoms of it, as they lack the requisite body parts. It's just not physically possible.
So I think this must be a question used to point out to transwomen that they are not female. Which I expect many would get annoyed about and give a snappy answer to, as they want to be female and probably don't want to be reminded that they never really can be.
That surely can't be a question asked in good faith though? Both the asker and the answerer will know that it is impossible for transwomen to menstruate, because they are male. So such a hostile response must be a slighter politer version of telling the asker to quit with the bullshit questions and piss off.