> Someone's interpretation of their own sexuality or gender affects no one but themselves.

I don't feel you've really followed the debate. Some trans rights activists are demanding that they be legally defined as the sex they 'identify' with. This equates to biological men being housed in female prisons, biological men competing in women's sporting events, etc etc. It's an attack on women's spaces and the very meaning of what it is to be a woman and what women's experiences entail.

This is just a short summary but the idea that they are affecting 'no one but themselves' is way off base.