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> I'd like to politely clue you in that... If you really do want to be polite, then it's better to avoid expressions like "clue you in."

• unimpressive 10y ago
  And if you had a clue, you'd know he really had no intention of being polite. ;) Phrases like that exist to indicate that one is emotionally dissatisfied but at a level where it's bubbling underneath the surface rather than something you'd like to display fully. It gives just enough plausible deniability of the fact for it not to become the center of discussion, while still unambiguously letting the person you're communicating with know that you're pissed.