Misogyny doesn't just mean you hate women. It can also mean you believe them lesser, or you do not respect women, or you are actively trying to undermine them.

Sharing lewd pictures is using the tools of the patriarchy to shame and humiliate women. That's misogyny.

Think of it this way. I want to humiliate a black man online, so I generate a picture of him eating a huge watermelon slice and share it around for giggles. Is that racism? Of course it is.