Saying ‘whatever’ or ‘I don’t care,’ even in a pleasant tone, makes you sound less than smart because it implies that you don’t have any thoughts at all. Nothing intelligent about that! Even if you’re just trying to go with the flow, you can still contribute to the discussion. If you have an opinion, share it politely. If you truly aren’t sure about something, ask questions and seek more information until you can give a thoughtful, useful response.