Normal?

John Locke stated that "man is by nature a social animal", if so does this mean we all have to be the same? Do we all have to want the same things, dress in a certain way, act in a certain way, just because we are social animals?
If we look all around us we see the same thing, we see all these different people, but they act the same. Why? Why are they so afraid to be themselves, we are they so afraid of being an "outcast"?
Let me explain this with an example: at school a girl dared to wear a flower in her hair that matched her whole "gypsy look"( like in the picture), nothing weird, extravagant or indecent, yet most of the people that saw her laughed, judged and criticized, because she did not wore something that was fashionable, something everyone is wearing. It's a bit funny that even the males found her outfit weird(even though males are not fond of fashion most of the times).
I've also noticed that this behavior goes beyond fashion or how one looks. People discriminate and judge all the things they do not understand ( i'm not reffering necessarily to race or religion, but that is a very good and well known example) or things that are different than their ideea of "normal". Based on the way you look, the way you act, talk, walk, behave, even based on your ideas and principles, people will discriminate and critic you until they leave with no choice but to be like they or else they will throw you away form their "perfect" society

According to the dictionary, "normal" means:

-conforming to the standard or the common type; usual; not abnormal; regular; natural.

-serving to establish a standard.

-approximately average in any psychological trait, as intelligence, personality, or emotional adjustment.

-free from any mental disorder; sane.

-free from any infection or other form of disease or malformation, or from experimental therapy or manipulation.

-being at right angles, as a line; perpendicular.

And according to the urban dictionary: normal= a word made up by this corrupt society so they could single out and attack those who are different.
And i agree with the urban dictionary more.