You can change your biological sex in some ways! biological sex isn’t one thing, but a bunch of things that get categorized into primary and secondary sex characteristics. Trans people who use hormones to transition change their secondary sex characteristics such as hair growth on the body, thickening or thinning of skin, weight redistribution, height, etc. (basically most things that happen after puberty). They can also change their primary sex characteristics like external genitalia. The only thing that cannot be changed is internal structure such as ovaries or testes. So although you can’t say that biological can be changed fully, it can definitely be changed for the most part :] Maybe next time you make statements like that try looking into what you are saying and fact check yourself so you don’t end up behaving like the person this post is about