I don't know should i cut off my childhood friend because of one situation that i don't appreciate

it happened one time when we watched the boondocks. we're russians and my friend isn't really familiar with black culture and doesn't use foreign socials like Twitter, TikTok, Instagram, barely used Tumblr just to post art. he heard characters saying n word and thought it was funny and repeated it and i felt confused and after awkward pause he corrected himself and i explained why only black people can say it. He seemed to understand but I'm still not sure how to feel about it. I have followers online and friends and i genuinely feel terrible because they probably think I'm super progressive and would immediately cut off someone like this.