Pointless gender segmentation

Tag on "Pajamas for the Whole Family", Walmart

Tag on "Pajamas for the Whole Family", Walmart (Detail)

Tag on "Pajamas for the Whole Family", Walmart (Detail)

These pajamas are sold as a boys' garment. Why?

The design has a pizza slice fashioned as a Christmas tree on the top and pizza slices and Christmas lights all over the pants. Why is pizza the sole domain of boys? (My daughter loves pizza.)

This sort of needless and pointless gender targeting really gets on my nerves.  In the 21st century I have no idea why big companies like Walmart still do it. Are they just sexist and lazy? A bit sad if that is still the motive.