"Control yourself, Alter your thoughts, Delete negativity."
It's tough to live a positive life around negative people, dealing with negativity can be quite a downer.
It's vital to set the limits and distance yourself when necessary.
Proverbs 4: 23 alerts us to; "Gaurd your heart, for everything you do flows from it." With negativity around you cannot perform your best self. Be wise enough to walk away.