Earlier quoted context omitted.
Not with that attitude you can't. Racists aren't (usually) racists for the fun of it. Racists are racists because they feel threatened by or lack sufficient exposure to / understanding of other races. If your goal is to cure racism, then making racists feel even more threatened is probably the least productive way of going about it. Instead, the trick is to befriend them. Show them that there's nothing to fear. These…
No, the "trick" is not simply to befriend them. That is an incredibly simplistic and naive way to interpret hate, and it shows you haven't had to deal with racism strongly impacting your life. Not all bigotry is based in innocent misunderstanding. Sometimes it's intentionally strongly held convictions of derision and superiority. The answer isn't to spew hate back at them, but it certainly isn't to make friends.
I never said it was innocent misunderstanding, but it is still misunderstanding nonetheless, and it is still possible to at least start to correct this misunderstanding by alleviating the fear underlying it, thus making it easier for a racist individual to expose oneself to those "inferior" races and realize that they're just fellow human beings and not scary job-stealing world-order-establishing criminal boogeymen.