People are different. Boys are different from boys, girls are different from girls. Emphasizing the difference between girls and boys suggests that all boys are essentially the same, as are all girls. The modern difference between boys and girls is almost entirely cultural.
Instead of having a “boy box” from which boys have to pick stuff, and a “girl box” from which girls have to pick stuff, let’s just ignore the boxes and let everybody pick what they want. The pink aisle makes no more sense than a green, purple or orange aisle.