People base everything they believe in and everything they know on their own limited amount of experiences and if something doesn't fit neatly in to that, it is wrong or bad and they are judgemental against it.

Believe it or not, many, many, many years ago, this attitude was not a bad thing. It was actually a survival instinct. If something didn't "fit" one avoided it because it could harm you. Now, however, we live in a much larger world and society and people still react that way, which almost never applies anymore.