Because women can't compete at the same level for those sports. That's why there's separate leagues. Even in golf there is a vast difference in ability.
With wrestling, and almost exclusively at the lower weight classes, you will sometimes (although very rarely) see girls who can make up for the strength difference with better technique.
These girls aren't asking for a leg up or a hand out; they have to compete on the exact same playing field at the exact same weight wearing the exact same uniform.
I think the girls should be commended; it's an unbelievable achievement made without the leftist staples of gender norming or affirmative action.
I disagree for a couple reasons. If a boy loses to a girl wrestling the boy faces all kinds of grief from his peers for the rest of his HS years. If a boy hurts a girl wrestling the boy faces all kinds of grief for "beating up a girl". Also, a precedent is set that can be used to carry over to other areas of life.
For example, women professional sports reporters now walk into locker rooms before all the men are dressed, since "we are all the same". I think this is offensive.
In my book the young man deserves the credit for recognizing that Boys and Girls are different and should not be doing certain things together.