Why can't people just give "their" answer to a question?

A question is asked.
Example:
What is your favorite color?
You say blue. But there is always going to be someone that will say “green” and blue is an ignorant color/answer.

What is with that?

All you can do is be as honest as you can. The “right” answer or “proper” answer will tend to have a majority rule to it.
The value of giving/getting a GA.
But, you still get people that will take offense to what you are saying and voice that opinion. That, taking away from your desire to provide input.