The usual lies here
www.thedailybeast.com/south-dakota-is-close-to-discriminating-against-young-transgender-athletes
Essentially, the South Dakota High School Sports Associations passed rules saying anyone can identify onto a sports team with no kind of physical/hormonal change/medical, just identify as a female 100m sprinter and you are. www.sdhsaa.com/Portals/0/PDFs/TransgenderProcedure.pdf
Now the State Senate is considering a bill which states that the sex on the birth certificate is the sole determinant of sex for sporting purposes.
The Bill is actually quite open, in that previous Bills said you should look at the original certificate of birth,
thinkprogress.org/south-dakota-transgender-original-birth-certificate-57b570fa16c4/
But this one omits that
sdlegislature.gov/docs/legsession/2019/Bills/SB49P.pdf
And you can have your birth certificate changed in South Dakota
en.wikipedia.org/wiki/LGBT_rights_in_South_Dakota#Gender_identity_and_expression
no surgery is required.
So they aren't even stopping male-bodied people competing as girls, they just are stopping people 'identifying' into it casually.
But no it's obviously hateful bigotry, literally murder.