Nursefag here. That is the way it used to be, but that has been updated. They now give Rh+ blood to Rh- patients, IF they are not female and of childbearing age. I have given many units of Rh+ blood to Rh- males. Also, in an emergency, Rh+ blood can be given to pregnant Rh- patients, as long as Rhogam is administered.
https:// www.bloodworksnw.org/medical-services/transfusion-medicine/emergency-red-blood-cell-use