I agree with your trainer that it's inappropriate, but I wouldn't call it awkward. It's casual and often personal. It would be an appropriate reply to an unsolicited compliment, even in a call center context.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
samwalkerWhat about 'that one' or 'this one'? shouldn't ONE be removed?In my opinion, yes. I hear it as a "fixed expression" without the "one." - A.