Look at nature. Life is full of variety, yet everything has a function. A car can have a great engine, but with no battery to start it, it's useless. Without tires, the engine can start up fine, but the car will not go anywhere. All components serve a role, no matter how small, to make the car operate in the most efficient manner.
Life is the same way.
When we show respect to all people, we open our minds to challenging our own beliefs, if we can accept what others say without offense. Try to understand why someone believes the way that they do. We're all here for a reason. It can happen to you again, and again, and again. Accepting all is really just a way of loving all.