what is the value, exactly, of saying that because his skin is brown, that we have to ascribe some sort of negative modifier on how we perceive his intelligence
None, because as an individual we can make an individualized determination for him.
intelligence is an INDIVIDUAL value. it does no good to class all people according to an arbitrary signifier.
It does if that arbitrary signifier has correlations with important outcomes.
The "good" is that it allows us to spend resources more efficiently when we want to influence those outcomes, or to conserve resources and accept certain things instead of trying to fight them.
As an example, there is a great deal of money and time being spent to address racial achievement gaps in education. The assumption is the aggregate statistics for each race should be about the same. What if that assumption is wrong? Then we're wasting money that could be put to much better use.
if you were interviewing a bunch of people for computer programmer, and disregarded the ones with brown skin because they were "less intelligent," you might have hired a dumb white person and disregarded the black genius
You're right, and that's a great example of dumb racist thinking. That doesn't mean much because non-racists or anti-racists are dumb too.
therefore, according to racist "thinking," we should assume all white people are rapists
See, this means you don't even understand what you're criticizing. What's this "all" business?
Here's a better example. Men are more likely to commit rape than women. Women are more likely to be raped than men. Pop quiz: did I just say that all men are rapists, or that all women are raped? Answer: nope.
by believing in racism, and all of the logical fallacies that come with it, you have objectively proven to me that you are a stupid person. i don't respect you
To me the biggest problem with you is that you conflate "acknowledging racial differences" with "believing in racism." Acknowledging that men commit more violent rapes than women clearly doesn't make me sexist. Does acknowledging that black men have a higher rate of committing murder than white men make me racist?
I don't consider myself racist, or at least not the dumb kind of racist you were talking about above who wouldn't hire a smart black guy because of a firm belief that all blacks are dumb.
But whatever. I don't respect you either because you've shown you can't have a serious discussion. You're hiding behind calling me "low iq" even though I'm quite smart, as are most people on Slashdot, and that should be evident to you from reading my posts.