Our brains all interpret stimuli differently, and decide what to filter out because of its level of importance. This is why each person develops into a unique individual, because each person has a series or choices they make from the time they are born. Each person has a specific view on the world because of their surroundings and environment. No one is the same and that is a great thing.
It is a wonderful thing.
If we all were the same, the Earth would be an awfully boring place!