Respect with a distance. The more you talked about how incompetent he is, the more he would try to prove himself and then intensify the tension between two of you.
我也遇到過同樣的問題,跌跌撞撞碰過犯過不少錯誤。現在也還做不好,但已經意識到很多時候是我自己沒做好。跟中國人更容易起這樣的衝突,是因為我們的想法類似,互相明白對方的做法。和老外過招,往往還不明就裏呢,就敗下陣來了