haterhat‧er /ˈheɪtə $ -ər/ noun [countable] 
1someone who hates a type of person or thing: 
I’m not a man hater. He was a hater of injustice.2informal someone who expresses their disapproval of a person, often on the Internet or Twitter – used to show disapproval: We love you – just ignore the haters!
1someone who hates a type of person or thing: I’m not a man hater. He was a hater of injustice.2informal someone who expresses their disapproval of a person, often on the Internet or Twitter – used to show disapproval: We love you – just ignore the haters!