Learn how they feel about other cultures, races, and political issues. Ask their opinions on nearly anything, and most often, even a 6 year old will offer some perspective never viewed by an 'educated' adult. If we don't teach our children correct principles, that all that moves is sacred, that all living things are human, and that all things deserve the most basic level of respect, then we'll not only see people persecuted for their sexual preferences and race in the future, we'll have individuals being persecuted for the way they comb their hair, the kinds of shoes they wear, and for the music they listen to. Creativity will cease out of fear. Fear is the greatest tool that evil wields.
Fear is the means by which wars are begun.
Education is the key to destroying fear. We don't have to love or even like someone to accept them. I don't like vegetables, I don't like strong perfume, and I don't like many other things in the world around me. Yet I also recognize that there are many who might not approve of, or like all I do as well. And just as I know my perspective has merit, as much as I might hate to admit it, so does theirs.