Oh, so, so many.
Literally. Used to describe something that is evidently not literal.
Kind of unique. Unique is a superlative. It's either unique or it's not.
Use of adjectives in place of adverbs, e.g. "She was dressed nice". "How are you? Good thanks."
Misuse of less and fewer. Fewer has almost fallen out of use but when you know the grammar rule hearing less used incorrectly grates. 'Less people' makes me wince.
Incorrect use of who and whom.
Incorrect use of myself and other reflexive pronouns, e.g. "When you call ask for Jane or myself".
Similarly, using 'Jane and I' if it should be 'Jane and me' because you think you're being posh. "For whom is the bottle of Lambrini? It's for Jane and I".
Your/you're confusion. 'Your wrong about that'.
Bare/bear confusion. 'Bare with me'. I'd rather not!
Greengrocer's apostrophes: Banana's 50p a lb
I'm a grammar pedant so all of the main offenders bother me. I'm well aware that language is a living thing and will change over time. Change from ignorance still irritates me.
Beyond grammar, how anyone indulging in slightly, and possibly temporary, selfish behaviour is a narcissist.
I heard the term 'flexitarian' the other day. Which describes the human diet since prehistory, doesn't it? Why is the word needed?
I'll think of many more but that will do for now.