You're on a hiding to nothing when you criticise the "misuse" of literally. Your example is clearly ludicrous, but using the word in that outrageous sense can be a good instrument of humour. Mrs Steve is a stickler for being on time whereas I'm late for everything. I might be just stepping out of the shower when I call downstairs "I'm literally in the car!" in order to mollify her (it doesn't work). Literally in that exaggerated or "incorrect" sense has been in use for about 300 years. Even Charlotte Brontë did it. It's standard English, and if you criticise it you're literally up sh*t creek without a paddle.