Other’s Faults are Our Own
It is easy to pick fault with other people. In fact, often we gain a subtle enjoyment from highlighting the faults of others. If we are truly honest, however, we will see that when we criticize other people we actually have the very same weakness ourselves. Perhaps we may not make this mistake quite as frequently or as badly, but we still share it to some extent.A funny example is how frequently people will say things like, “X is such a terrible gossip, he’s always negative and criticizing other people.” We say things like this; but ironically, we are doing exactly what we are criticizing them for! Another interesting point is that often people who grow to dislike each other are often very similar. The faults and personality traits we can’t stand in other people, are often traits of our own personality. I’m sure you can think of two people who dislike each other, but share many similarities in habits and personalities.
http://www.pickthebrain.com/blog/things-we-hate-to-admit/