It's a definitional distinction. The "black laptop market" is different from the "white laptop market", in much the same way as luxury good markets work (see also: the Apple Watch Edition). It's the same as with haircuts -- women have proven by and large to be willing to pay more for haircuts than men, so women's haircuts cost more, in general.
https://en.wikipedia.org/wiki/Gender-based_price_discriminat...Price discrimination gets a bad rep because of the name I think, but as Wikipedia points out student discounts are probably the best example and are basically uncontroversial.