He can’t—or, rather, he can’t provide any scientific sources to support his false claim—but a 10-second search on google for some combination of the words “female”, “male”, “infants”, “study”, “preferences”, “toys”, etc will yield an entire literature that lends extremely strong support to the (already obvious) proposition that men and women are—gasp!-innately different. Proceed at your own risk (that is, risk to your feel-good, false beliefs).