In your culture, when is negative feedback taken personally? When is it not taken personally?
Can you remember when you received praise which really motivated you? Or when you praised someone and it had a motivating effect on them?
Voicing criticism is sensitive in any culture. In your culture, when is it absolutely necessary? How should it be communicated?
When is it appropriate to criticize another person in the presence of other people? When is it constructive? When is it destructive?
Explain to your colleague the scoring system in one non-business context of your culture. What is the logic behind the system?