I’m not a fan of the term “positive discrimination” at all. It tries to hide the fact that the “positive” effect to one group is necessarily at the expense of another. Whether it’s positive or negative just depends on which group we’re talking about.
(To clarify, the comments said, “I dislike people of X color because of the behaviors I’ve observed in people of X color.” And they argued that it wasn’t the same as just hating people based on color, although that’s exactly what it is.)
And you can talk about statistics and averages and whatnot all day, but once you start applying averages to individuals – which is essentially what "positive discrimination" or "affirmative action" amounts to – you're always going to be wrong in a very substantial number of cases.