“Feminism killed chivalry” like…no it didn’t? If anything, feminism encourages chivalry.
Out in public with the guys and one of your friends makes a sexist comment about a female friend/stranger? Rise to her defense. She’s a human being and she doesn’t exist for you. She exists only for herself. You won’t tolerate this kind of talk.
At a bar or club, and you see a man slip something in to a drink/relentlessly pursuing a woman despite her many protests? Tell him to knock it the hell off. Get her out of this situation safely. He’s an enemy of women, which means he’s an enemy of yours if this code of chivalry means so much to you.
If you insist on being a warrior for women, then be a warrior for women. Listen to the things that we say and need and ask for.