That's still not enough evidence and it is still definitively bias. I mean no disrespect. With billions of people on this planet, generalizing on gender using personal experience alone will always be biased. Even if there were some truth to it, the notion that women make better teachers is likely cultural, not biological. (sans some scientific explanation) It correlates with the notion that women make better parents (teaching, nurturing and when necessary disciplining children are skills that both good teachers and good parents share).

This belief is a cornerstone of traditional gender roles: men work, women raise children. Of course now we say: well women work too. So now men work and women work and raise children. Do you see where this is leading? Emotional labor for women, divorce for men, single parent households, men alienated from their children. I know it seems like I'm reaching here, but that's where I feel that notion that men are incapable (or at least less capable) of raising children leads.

I can understand when people say that men are better suited to hard labor. I think, generally speaking, that may be true. I can be convinced that I'm better suited to hard labor than most women. I don't want to do hard labor. I can guarantee that there are women better suited to hard labor than myself. So it really boils down to this: if a person wants to do a job and can do that job, gender is irrelevant.