It has been a constant advice that we should avoid people that are trying to put us down or causing some sort of trouble. Though the advice is really the best thing you can do. Some people are simply difficult to handle. No matter how much you push them away they just keep coming back. The best way to do this is to simply not put any effort or reaction on the things that they are doing to you. Simply think that they do not exists and for sure they will feel that they are just wasting their time and effort to you. You will get rid of them without you breaking a sweat in devising schemes to make them go away.