You can tell your children not to judge it; no one has suggested otherwise as far as I can see in this thread.
But keeping your children in the dark about how their choices are perceived when that may lead to them being ostracised or ridiculed is sacrificing them. You don’t need to tell them you agree with the attitude, but not telling them and allowing - or encouraging or forcing them - to adopt those things just because you feel they ought to be ungendered is unfair.
If they want to wear or do something regardless, then of course you support them - but still not by trying to keep them oblivious.
Those shorts are sold as shorts for girls and were regarded as girls’ shorts by most people on this thread. I’m afraid that’s a fact. It may be one you disagree with, it may be one every single one of us thinks is stupid but it is a reality of how things stand nonetheless.
Allowing your children to live outside reality to further your agendas is imo sacrificing them.