This is a deceptively complex question. It sounds so simple, but our world can't seem to work it out. Can we accept each other? Can we ignore differences? Can we forgive the history we share? The previous two answers said a lot; love each other. Be respectful. But there are people who refuse to play by these rules, and that puts the rest of us on the defense, and then on the offense.
I guess it is a one person, one neighborhood, one church, one town at a time project. Maybe if we say it loud enough and long enough, we;ll convince the others until we all get the message.
I like the RAOK approach. We do good for each other and bless each other and pray for each other and let random acts of kindness and senseless beauty infliltrate our world, or at least our little corner of it. Hang in there.