Titus 2:7 

In all things you yourself must be an example of good behaviour.         Be sincere and serious in your teaching. 8 Use sound words that cannot be criticized, so that your enemies may be put to shame by not having anything bad to say about us.  

Luke 6:31

 Do for others just what you want them to do for you.

Teaching your children respect ensures they will get to know a person before making a snap judgement. This behaviour will help them throughout their entire life, and ensures they treat everyone with kindness. As well, for some children, diversity is a hard concept to understand