After having read the article, he tries hard to mention that he's making generalizations throughout and that they are not true of every male or female child.
Fair enough...these are stereotypes/generalizations and we should take them as such.
Thing is... I don't think he tried hard enough. I think I wouldn't have had any objections if that had been his disclaimer ("These are just my experiences, I recognize they are not universal, and one should always try to find an individuals tastes and cater to those, regardless of gender - but for me, these are the attitudes I have most commonly come across.")
But basically just telling off any possible criticism before getting started, and dismissing anyone's right to even comment on his article? That was just inviting trouble.