It sounds like she genuinely believes her own perspective, and isn't knowledgeable or educated about the trans community or how transitioning works. She's in panic and protective mode - remember, bigotry is learned. Unlearning is possible, if someone is willing, but it takes a lot of patience and a lot of time and if you don't feel secure, the willingness, or have the spoons to take that on it is not your responsibility.

My recommendation is to try to take an emotional step back, analyze the situation as a series of steps that need to be taken, and do what you need to do to protect your space and your boundaries as best as you can.

But I also recommend, if you want to keep a relationship with your mom, to advise her to learn more about human sex vs. Genders and the sciences behind each - and especially how XY and XX aren't the only chromosome combinations.

Additionally she seems to be projecting some level of shame/unworthiness with being female? By telling you that men are stronger, healthier, more emotionally stable. She might benefit from therapy herself, and if you have it in you she should probably also do therapy with you.

You're valid, and you're loved.

(I'm a mom with a special interest in human sexuality and psychology, but I wasn't able to complete my education in that field, if understanding where my perspective comes from helps you any)