How do I refute this argument for transgenderism?

[Little_Tiger]

How should I refute an argument that a person being “transgender” is the result of a genetic defect? I argued scientifically that a person with a male genetic code is male, and received this argument in return.

 

[Michelle_Arnold]

Anyone who makes an assertion is obligated to substantiate that assertion. Ask the person to prove that transgenderism is the result of a “genetic defect.” If the assertion is substantiated satisfactorily, then you might ask whether or not it makes sense to base moral behavioral norms upon “genetic defects.”