Sir negative thought in every bodies mind . This is due to 1. failure in most of one action in there doings.2.surrounding and their envirement . 3. Because of their financial background. If a person wants to eradicates negative means he has meditates with some Prayers and also he has to make his mind in a positive manner.
Your vote on this answer has already been received
The more you try, more it will haunt. Cant ignore also. Best thing will be just to watch it as a third person. Nurture this third person to grow strong and the negative thoughts will weaken by themselves.