What to do if your bf is sexist??

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what would you do if you found that your partner is sexist? I need some advice because my sister found out that her boyfriend is sexist, and she sort of knows it already. He lacks respect towards her and even to me at times and he wouldn't really listen to her unless his male friends back her up. I don't interact with her bf that much so i can't accurately tell if he's sexist or not or he's just commanding to everybody. Also he's very traditional in thinking. He wants his gf to be able to cook and clean and all that women stuff. What's most worrying is the lack of respect towards my sister..