At this point, I think the only way to end this nonsense is for the girls to refuse to play against boys pretending to be girls because they aren't good enough to compete against the boys.

It is particularly bad in the physical sports like boxing, but as shown in this article, it is a problem in all sports. There is a reason girls and boys have separate sports. If it makes people feel better, call them XX and XY sports and avoid the hurt feelings, but that is the only consideration that should be allowed.