That’s an uphill battle. People generally don’t like being told how they’re wrong. Instead of learning anything, they’re more likely to make up explanations for their existing belief and thereby strengthening their wrong belief.

Or even broader; you can’t really teach anyone anything at all by telling them what is wrong or right. Understanding is something each individual has to figure out themselves. It doesn’t matter if you want to teach math or anti-hate or anything else. They just don’t get it until they figure it out.

For that reason it’s often better to simply question their belief. Don’t judge them, even if you know that they’re wrong. Just keep questioning until they’re forced to actually think about why they believe whatever it is.