Vertigo, I think you nailed the issue. It's not so much Chen discriminate you due to the colour of your skin, it's because of the extra cost he sees in you. It's very simple. For him, expat=more cost. Believe me, if hiring locals meant more cost, he will suddenly start treating all of you better. It's money, pure and simple. Which is why I warned you all not to go all celebratory mode due to his departure, whoever replaces him will probably do the same regardless of where he is from.