There are differences of opinion regarding whether it is moral or beneficial for transgender people to undergo gender reassignment surgery. Regardless of where you land in that debate, everyone should be able to agree that it is unfair to allow “transgender women” (biological men who identify as women) to compete in women’s sports.
This is not about equality, but fairness. Biological males have clear physical advantages over biological females, guaranteeing that transgender women will beat all or most biological women in sports. That is why we have always separated sports by sex. Allowing transgender women to compete in women’s sports is not fair to biological women. They practice and train for years to be the best among women, only to be beaten by a biological male.