Dad influence on his son

[Kkristine84]

I have a situation.
Me and my ex have a 9 years old together.
I've never noticed it in my ex before but he hates women. He makes stupid jokes about their appearances, thinks men are better at everything, speaks disrespectufully to every womanin his life (even his own mum) then says- it was a joke! And we are stupid or soft that we can't take a " joke" etc...

Now I notice that my 9 years old son starts to speak me or his sister or nana disrespectfully. Like makes a jokes too...

How do I explain to him that dads behaviour towards women is wrong? How do I go about saying that his dad is a "pig" 🙈 without actually telling him that?