Return of the Grammar Nazis!
Every language has particular and peculiar phrases that -usually- only native speakers understand, immediately. (Indeed, some such are relegated to only certain regions.) These are called idioms. And they enrich each language!
But some are so often misused that they cause aggravation!
May I submit the one that increasingly bothers me?
Comparisons that include the phrase "—, let alone — !" Isn't it obvious that the first term should be the specific instance and the second should be the general instance?
But many people, educated people, get the order reversed — that is to say, wrong!
Why? I'm unsure...
But perhaps someone else has their own "favorite" example of an idiom's frequent misuse?