why does grinch hate christmas

Because he's a bitter, lonely old man who has no joy in his life and resents those who do. He is consumed by his own bitterness and anger, and he's determined to steal away the joy of others in a misguided attempt to feel better about himself. But deep down, he knows he's wrong, and he's afraid of being alone during the holidays. So he lashes out at others, trying to drag them down to his level. But he's just too miserable to realize that he's the one who's missing out on the true meaning of Christmas.