There are few types of people, few who will suck your blood to the core. They will usually be critical about anything, pessimistic, and blame the world for their miseries. They have all the knowledge about the world, money, and how to suck energy and blood from others. They will excel at everything from showing fake confidence to giving talks. In short, they are good at everything minus their integrity, empathy, and ability to work/earn. Like a parasite, they will feed on your hard work, money, and success. Run away from such people as soon as you can. Every second of being with such people is like having a slow death.