No, you're making the same mistake racists and antisemites make - you're trying to turn a generalization into a rule about individuals. You can't go from the group to the individual. If men are stronger on average than women (this is an incontrovertible sex difference) that wouldn't mean that women are unsuitable to be in a profession that involves strength, because differences within groups are larger than differences between groups. A particularly strong woman would be stronger than the average man.

Similarly, a disposition that applies generally to a gender doesn't mean that gender is suitable or unsuitable - suitability is a term for policies that get applied to individuals.