Real life conversations, honestly. I have learned that if someone is not completely lost to the internet, their real life experiences will naturally allude to race realism. Every American that has been to public school subconsciously knows there is are differences between the races, but until they meet someone who explains race realism to them, it will remain an innate part of their consciousness. You have to wake people up, it's a pain in the ass and potentially exposes you to real life consequences, but interpersonal communication is easily the best tool at our disposal.