Sometimes people are uncomfortable and afraid of what they cannot understand intuitively and try to force their way of life on those who act in a different manner - children are especially cruel in that aspect. It is an instinct that could have helped humanity when it struggled with the elements and predators of nature, but today it is completely out of place and time. This will not go away, but could be diminished if kids are educated to accept and rejoice diversity. And that brings some weight on the shoulders of the parents and the teachers, who are usually unwilling or unable to teach acceptance. For the rest of us, it's only a matter of patience and understanding that it's the bullies' insecurities which drive them to these acts.