I don’t know that you can necessarily teach them. You’d be trying to combat negative lessons from across all forms of media and an ingrained idea that women suck.
A disclaimer on this advice: I’ve lost friends due to being an outspoken feminist. I finally found that my solution was to only be friends with other feminists or people who don’t identify as feminists but also don’t tell me that I shouldn’t. That was my solution, but it isn’t always practical.
Basically, I’m not going to give you a step-by-step guide to introducing feminism to your friends. I don’t know them, I don’t know you or what you are comfortable with, and I don’t want to give you shitty advice that will mess things up.
I AM going to say: just be true to yourself, make the call that’s best for you and don’t expect to miraculously change your friends or feel bad if you can’t change them at all. If it were as easy as “Hey, what you’re saying is kind of fucked up,” then both outright and casual misogyny wouldn’t be a viral infection in our society.