The answer is.....John 15:18-19.
"If the world hates you, you know that it hated me before it hated you." If you were of the world: the world would love you as its own, but because you are not of the world, I have chosen you out of the world, therefore the world hates you."
For some, anything and everything associated with the Christ brings hatred as he stated and predicted. Anything associated or closest to Christianity be it a tradition, a school, a person, an object, or an idea is the driving force of which some automatically take the opposite stance to the above. Of those that do this, many don't know they are doing it as predicted and stated by the Christ, but it's the very nature of the person that allows it to happen. Some do it intentionally and having full knowledge, and these are the dangerous ones. It's actually one of the central driving forces of their lives.