I don't think it really matters if boys have two choices while girls have three, or if it is the other way around. At a certain point, sure, if there is a huge difference in expectation it's really more burdensome for one group.
But putting so much emphasis on having just the same number of choices isn't that important. However, I do think that feminists, among others, have tended to support that kind of argument about needing the same number of choices, even if not so much in this particular discussion, so hearing it now from the other direction is an interesting twist.
I think if you made skirts, shorts, and trousers available to all, everyone could shut up, but in practice you'd see girls wear all three worn by girls and only trousers and shorts by the boys, and it would make zero difference to their lives.