I know it's difficult to transition from pretend land back to the real world but a man is a man and a woman is a woman. No amount of surgery, makeup and wishing upon a star will ever change that fact. All the same applies with trans men as well. I don't know why you think that is your big gotcha. As if we think trans men are really men lol. We are in reality bud. The same laws of biology apply to everyone other than a very minute part of the population that were born with birth defects.
I wouldn't kill the person either but I would never get to the point where my rocks were getting off because I know that women don't have penises. You know they don't as well but yet you pretend they do because you have to perpetuate the lie because that's what your political side is doing.
Gender is not a social construct. Gender roles are a social construct. A man cannot become a woman and a woman cannot become a man. If they want to perform the gender roles of the opposite sex, they can do some of them but not all. Men cannot have babies. Women cannot impregnate men. Men cannot have a menstrual cycle. Now roles that do not involve biology like working on cars, washing dishes, mowing the lawn, doing laundry etc. Yes, those roles can be done by either gender.
Your entire philosophy is completely torn to shreds by the simple question of "What is a woman?". I mean that right there should tell you that you're off in fantasy land with your ideologies again.