Really doesn't surprise me. Separation of sports by "men and women" is extremely binary. You can even see cis women with naturally high T levels compete in high level sports. Trans women aren't even allowed to win without feeling like they lost. Bigots make them feel like they cheated regardless.
I dont know enough about hormones and biochemistry to have a valid opinion on trans sports, but i'm 100% sure that the vast majority of criticism and debate is in bad faith by transphobes who never gave a damn about women's sport before