Originally Posted by
Frozen_Feet
The ethically important part is to judge yourself and others based on actual qualities and differences, instead of imaginary ones based on bias or prejudice, or just stupidity. Admittedly, humans have been pretty awful at this part, but the point remains.
That's not necessarily the ethically important part under certain systems. But it's certainly the 'correct' way to do it since you'd have a faulty judgement otherwise. (where 'correct' means accurate in a predictive sense)
Yet, at times, this is not possible. Lack of information or lack of time. Then you do use stereotypes and say "in the past, 80% of X have acted this way, I shall guess this particular X will do the same" and simply accept that you will be wrong 20% of the time because it is not practical to try to determine whether this particular X you are dealing with is one of those 20%.
Substitute numbers with experience/information sources and single X's with entire groups and you get racism. Perhaps justified, but still racism.