It bugs me when people say “the thing is is that” (if you listen for it, you’ll start hearing it… or maybe that’s something that people only do in my area.) (“What the thing is is that…” is fine. But “the thing is is that…” bugs me.)
Also, “just because <blank> doesn’t mean <blank>.” That sentence structure invites one to take “just because <blank>” as a noun phrase which my brain really doesn’t want to do. Just doesn’t seem right. But that sentence structure is very common.
And I’m not saying there’s anything objectively wrong with either of these. Language is weird and complex and beautiful. It’s just fascinating that some commonly-used linguistic constructions just hit some people wrong sometimes.
Edit: I thought of another one. “As best as I can.” “The best I can” is fine, “as well as I can” is good, and “as best I can” is even fine. But “as best as” hurts.
The most grating to me right now has to be the comma splice (run-on sentence). For example: “Every one of our talented art students will have artwork represented in the show, it is always an impressive event.”
I see it everywhere lately! Even in official business/marketing emails. Someone got a college degree and got hired to write that email ffs. Use a damn period or semicolon.