I am sorry, but this is nonsense. Even if the world sucks, the logical, smart response would not be dispair and depression, because that fixes nothing.
Also things like looking down on other or defensiveness are symptoms of low self esteem, not a high one. If you really are confident in yourself, you don't need to feel better than others, because you feel good about yourself.
You can understand the world and still try to enjoy your life. The world always sucked and people found ways to cope with it. But that is a skill, that doesn't always come naturally, but you should always strife towards that.
I am sorry, you are going through this, but don't try to rationalize it. It is nearly rational, nor is it an inevitable outcome of high intelligence (this is not a judgement of you personally by the way).