There was a bevy of about 30 baby chicks huddling together. One of them were taken out and placed back with a red ribbon around its neck. Then other chicks tried to run away from the red-ribbon one and never let him join. The experiment was tested on another chick but the result was the same.

Interestingly, the first red-ribbon one did the same thing to the next red-ribbon chick when he was placed back without the ribbon.
It is said to be an instinct of children. Children are weak, and huddle together and avoid something different to protect themselves.

The same experiment was tested on 30 ducks. And it is found that they acted different from baby chicks. Ducks didn't care about the red-ribbon one among them and walked around together.

Grown up ducks could judge whether the one with different look would make any harm or not.

Why we human beings can't do what ducks can?

Grown up people still like to gather in crowds and try to protect themselves against things different from them and with no information by ignoring, escaping, and attacking in numbers.
That is the only way human beings take.

How do you feel if your child brings a homosexual lover?
What would you do if your parent introduces you a homosexual lover?
What would you do if you have a feeling against a person of same sex?
What does that mean to you being heterosexual?