People who refuse to change how they misuse or misspell words. To/too, could’ve/could of, brake/break, and all that. I know they’ve read the correct versions, they just refuse to change.
Followed by people trying to justify the misuse. We have dictionaries. There’s some kind of standard. Yes, language does drift. But unless we want to go back to the 1600’s or so where people just made up whatever looked right for spelling, there should be some effort in maintaining a standard and not just “I can’t be bothered to do it right so I’ll claim common usage or language drift.”
That, and people who drive with their hazard flashers on for no apparent reason whatsoever.