No, non siamo perfetti, perché siamo umani. Se sei perfetto, non sei umano.
Non preocuparti, non devi essere perfetto. Solo sii umano.
Curious. We can also say "Aren't we perfect?", with doubt to the second person. Hence expecting "No we're not (perfect)", but if the second person said "yes", it is taken that the second person agrees that they are perfect. Does the same conversation rules aply in Italian?
Duo spoke this phrase to me as a listening exercise, but I can't hear any inflection in the voice that made it sound like a question, so I took it to be a statement, "we are perfect". Either the inflection used in Italian for questions is different from English, or Duo hasn't got it right, or it's incredibly subtle!