Negativity is contagious. If you hang around negative people too long and expose yourself to their toxic attitudes, cancerous mindsets, and debilitating world views, you will more than likely become infected. There is just no way around this. Even if you’re a positive-minded individual with an overall optimistic life perspective you run the risk of infection. Regardless how fortified you think you may be to ward off negativity, too much exposure will create an exploitable crack in your border of positivity. So what is one to do to avoid negative contamination? It's simple. Limit your exposure to such individuals and environment. Period. If this is not possible then you will have to go the extra mile to fortify yourself with increased dosages of positive thinking, surrounding yourself with other like-minded people, reading books, watching videos, hearing audios and whatever else you can do to barricade your mind and spirit from this disease.