Barriers exist to protect us. To divide us from things that are considered harmful. But these physical walls can manifest themselves in our minds. Separating us from the rest of society.
It may not have occurred to you, but every day you are judging. Who should you admonish from? Who don't I like the look of? Money, figuratively, is just one of these many swords of separation; you don't exactly see millionaires 'hanging out with their homeless pals', do you? Appearances and aesthetics. Our class, whether in the financial or social ladders. Even our taste and idiolect acts as the ultimatum that divides us from others.
All of these conventions exist in our minds. I for one, couldn't care less if a person is rich or poor. But some do. Fixations on these factors means that you are just "oneself", never more. Personality is merely an illusion as we are - in reality - the same. We're all homo sapiens after all! Coherently, all of these "walls" are merely tools we've created to avoid people we've deemed unbearable. There's nothing that separates us from one another.
It was suggested by author Jorge Luis Borges that memories are not proof of identity. De facto, these mental recollections are simply words we use to describe experiences that all happen repetitively in roughly the same way. In other words, we experience the same things, we just explain them in different ways.
2012 has been popularly dubbed "the year of the underdog", providing the perfect catalyst for us to embrace our differences, yet ultimately observe that we do share many similarities with each other. That externally effeminate male may share your love of Manchester United, for example.
The thought that we are all the same can sound implausible, I admit, it really does. There's nothing actually detaching you an I from one another (albeit, the computer screen may not help) we're the same species with the same dreams. Our lives are just... equivocal, that's all.