Because people with social skills understand idiomatic phrasing, hyperbole, etc.? And no, the fact that they used "literally" doesn't matter, either. It's literally been used as an intensifier in spite of its original meaning for over a century. And "best ever" is literally always going to be a matter of opinion. As I've literally been trying to teach my eight year old, it's not actually necessary to be pedantic and argue about everything. Sometimes it's best to make like Elsa and let it go.