It's not the job of members of minority groups to educate members of majority groups on their culture. People who aren't members of minority cultures should make an effort to self-educate and work against the grain of systemic discrimination.
I agree it's not his job to educate, and he shouldn't have to. But in reality, most racists are not going to educate themselves. If they did, they probably wouldn't be racists. So if he actually wants to see a positive change and stop Steve from making racist comments, his best bet is to try and educate Steve himself.
HHAHAHA WHAT THE FUCK AM I READING?