The problem is how he insists on traditional gender roles and stereotypes that are actually not supported by science. Personal freedom and autonomy should come first and foremost. His ideas are opposed to women’s rights and opportunities in society, and that’s not okay. Just because there are biologically derived differences in means for various characteristics does not mean it is okay to stereotype entire groups of people or force them into undesired roles. It also does not negate that factor that social factors influence the manifestation of gender differences greatly.