These people are not dealing with reality and you are right to call them out on it.
Sex isn’t a complicated thing, society makes it a complicated thing. You are who you are. Your comparison with someone identifying with another ethnicity is false. You can tell it’s false because there aren’t a lot of people that feel that way. I only know of one person, the former head of the NAACP, Rachel Dolezal
Marcel your smarter than this. Sex and gender are two different things.