Sorry, but my sisters are getting assaulted for these kinds of things. This is the reality.
Check the end of my post for another realistic solution.
Yes, but they easily could be, which is the point, especially in a sport like Bowling. You're saying all of these things like 'boys do not play against girls' and 'boxing divisions are not genderless' as if they are some kind of natural law, written at the time the universe was created.
They aren't.
There are ways to change the system to be humane and protect the rights of transgender people to express their identity as they wish and also the rights of non transgender people to participate in fair competition.