My brother is using gendered slurs

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I usually consider my brother to be of strong moral character. A strong advocate of socialism and BLM coincides with his philosophy degree well. He has preached to my parents the intricacies and profound depth to drag culture along with the importance of proper usage of pronouns.
I fully support such moral and strong ideals but his recent actions have me developing genuine fear of his moral degradation. He's been a long time player of Overwatch, the hit game by Blizzard. I understand his complete freedom to play such a deep and complex first person shooter, but his hateful use of gendered slurs, notablely b*tch and c*nt, is absolutely deplorable. I honestly can't understand how such a intelligent and progressive male with a loving a poly-amorous cis-women girlfriend could possibly be okay with using gendered slurs on video game voice chat.
Are there any individuals out there that have dealt with similar circumstance? I can't believe I'll have to watch GDQ by myself if he keeps using this language.