I'm not sure why you think it has to be necessarily. By analogy, would you say that racism is supposed to be an abnormal thing? We have plenty of examples of societies where racism is or was the norm.
In contemporary Western society, misogyny is considered abnormal.
But like I said, I'd require a more thorough definition of what the OP considers "misogyny". Because for some people I've noticed that all minor annoyances and socially awkward situations are misogynistic and sexist.
I'm not sure why you think it has to be necessarily. By analogy, would you say that racism is supposed to be an abnormal thing? We have plenty of examples of societies where racism is or was the norm.