wonderful ideas, and i see exactly what you mean.
ideas can fail because of too much sarcasm and conservatism.
when you put "white" and "coloured" in that context it's impossible not to feel what you feel!
and i think everyone should be careful as much as possible. but sometimes people aren't aware of the references they are inferring.
in these kinds of cases surely it's better to explain to them their "brick" than to fire them.