Because if you think about it from another angle, boys will look very feminine if they wear flesh-colored stockings, while wearing white stockings will feel cleaner and feel like a big boy, so it is normal for boys to wear more white stockings than flesh-colored stockings.
In fact, some things will cause ambiguity about the way boys dress, but as long as you pay attention, there will be no problem.
Therefore, the reason why they like to wear white stockings is mostly because of the aesthetic trend of the public, not their own wishes.