Just go be around someone more miserable and weaker than you are. You'll notice that aching pang of contempt and disgust in the pit of your solar plexus, gnawing at you every time you hear them whine and complain like a baby, especially when you know their own problems are exacerbated by their own stupidity. Now imagine you are asked to date them. You'd say no. That's why it's important to make sure you put effort and work into yourself before considering dating.