While it's true that sex and gender are distinct concepts, it is also important to consider the potential implications of adding gender identity to anti-discrimination laws from a practical standpoint. For example, including gender identity in these laws could complicate matters in sex-segregated spaces, such as bathrooms, locker rooms, or sports teams. This could lead to privacy and safety concerns for some individuals, as well as affect the fairness in competitive sports.

Moreover, while the human brain is complex and gender might have some neurological basis, these differences might not be as clear-cut as you suggest. It is still an ongoing debate among scientists and psychologists.

I encourage you to think about these potential complications and provide a solution that addresses these concerns while still ensuring that everyone is treated fairly and with dignity.