Do you realize rather than allowing another to drag you down instead accept you are just as capable of lifting them up? How? By making your interaction a positive, productive, enthusiastic, and empowering one.
Understand when you come across someone who is not as positive and upbeat as you are. You have a choice you can sink to their level or you can take the time to raise the other person up to your level.
Beginning today commit yourself to be the person others see and ask how can I be more like you. How? Begin to work on being the person that others are lifted up by the time they are able to spend with you.