OK, it's not a disliked phrase so much as a misused word, but we are already including those so here goes..........
Saying "rift" instead of "riff" - e.g. 'I liked the guitar rift in that song.'
(On balance: Actually, I'm pleased when a non musician at least tries to use some musical terms even if they don't quite get it right. So maybe I shouldn't complain. But I am anyway 🙂 )