Unless you've crawled inside someone's skin and felt the words that claw away at their throat and suffocate them during the night, you have no right to tell anyone to get over it or that they shouldn't be upset.
the toxic person. They live in a blissful world where nothing is ever their responsibility. When bad things happen, it is because the world is against them! When they are raging abuse at you, it is because YOU made them angry.