“Males who choose to call themselves females will have all the advantages males have in sports....”
Some advantages in some cases such as skeletal height, but not in all cases and not in some cases. MTF (male to female) transgendered individuals whose hormonal balance has been stabilized to that of a biological female exchange the stronger male form of cellular muscle tissue for the weaker female form of cellular muscle tissue. Much of the same is true for the distributions of fat as well as muscle, but not for the skeletal frame other than the tendency for developing osteoporosis. The same is true for the FTM transgendered individual, gaining stronger cellular muscle tissue while retaining the wider hips resulting from the female girdle widening during female puberty. Such hormonal changes in the MTF individual for a prolonged period of time results in generally similar musculature as a biological female of the same size, permanent impotence, hypogonadism with retreat of the gonads, and permanent chemical castration.
But we are talking high school sports here. I doubt that most of these boys calling themselves girls are actually in significant hormonal therapy.
One of my closest friends, who is a lesbian, seriously objects to sex reassignment. She’s told me that she believes God made us the sex we are and then it is our job to deal with any challenges that brings without trying to outsmart God. Smart woman.