My friend’s love for catgirls really creeps me out

My (2m) friend (22m) loves catgirls and always posts them on social media. His catgirl obsession is really ruining our friendship. I honestly just can’t stand catgirls and don’t understand why someone would want to post them all over their socials. I don’t want my family and friends to think I’m being friends with a creep. How can I bring this up with him in a polite way?