A hater is a person that simply cannot be happy for another person. So rather than be happy, they make it a point of exposing a flaw—whether it exists or not—in that person; hoping others don't like them either.
Here's how you deal with haters:
When people don't know your life—they speculate.
When they think they know your life—they fabricate.
When they do know your life—they hate.
No matter the circumstance, walk away. Never give anyone the privilege of knocking you down so low, YOU BE COME THEM!
Because it is never about you, it's about them. And if you are the 'hater', remember this:
HATE IS HEAVY, LET IT GO!