Hafshya
A hafshya is someone who can't stand anyone else being happy, and if they're not, they make sure you're not either.
My brother is a hafshya. He took my toy and then said I was being mean.
My friend is a hafshya. She took my seat and said I was being rude.
My cousin's friend is a hafshya. He took my snack and said I was being greedy.