It seems to me like a poor joke - He likely meant that by being a white male, he is not helping out on the diversity ratio.. not that he has undesirable identit

It seems to me like a poor joke - He likely meant that by being a white male, he is not helping out on the diversity ratio.. not that he has undesirable identity. He could have better phrased it as 'yeah.. I just joined and that did not help the diversity ratio' which would still be funny and will make the same point. I also think you are overly sensitive to race issues and that makes it worse.