The essence of synergy is to value differences-to respect them, to build on strengths, to compensate for weaknesses
It's not that we ignore our weaknesses; rather, we make our weaknesses irrelevant by working effectively with others so that we compensate for our weaknesses through their strengths and they compensate for their weaknesses through our strengths.
When we look through the lens of each others' weaknesses, we make others' strengths irrelevant and their weaknesses more evident.
Don't argue for other people's weaknesses. Don't argue for your own. When you make a mistake, admit it, correct it, and learn from it / immediately.
But borrowing strength builds weakness.