Those who claim that a) gender and sex are the same thing and that b) there are only two of them ignore many scientific facts.

Third, fourth, and fifth genders have been historically recognized in many cultures worldwide. Scientific research shows that transgender individuals literally have different brain structures. 1/59 people are born with reproductive or sexual anatomy that doesn’t seem to fit the typical definitions of male and female. 1/508 people are born with chromosome patterns that are XXY, XXXY, X, XXX, XYY, or other variations besides XX or XY. Gender is a sociological concept, and sex is a biological concept.