When you feel that your energy is drained: some people drain others by small talk by trying to involve you in some of their pointless conversations. When you see that they are not gonna help you to be a better you: whether they are people with no goals or people with no talents or experiences, simply people who are here in this life just to eat,drink, have sex and sleep. Cut them offfffff. When they are acting really dumb and/or embarrassing you: this kind of people is really really tiring and can cause you so much trouble. When they are concentrating on your life more than theirs: it’s not just annoying and frustrating but it brings so much trouble,believe me.