...you aren't born with it, it's taught, either with intent or just from "being in the air". Thankfully, despite growing up in the southern US, my family did not subscribe to any of these attitudes, and I don't give a rat's @$$ if you're white, black, purple, or green - you're either a good person, or you're not.
My story of dealing with racism:
Back in '83, I was working as a bartender in a small bar in Slidell, LA (where I grew up - bar is long gone now), it was open 24 hours, 7 days a week (they take partying SERIOUSLY in southern Louisiana!

), and I had the 11-7 shift, which catered mainly to 3rd shift NASA Michoud Assembly Facility workers heading home to Slidell (Michoud is where they build the external fuel tanks for the shuttle).
I'd been working there for several months, and enjoyed the job for the most part, until one night a black guy came in and sat alone at the bar. I went over, greeted him, took his order, filled it, chatted a bit with him, not giving it a thought - he's a customer to me, and seemed like a good dude, just wanted a couple drinks on the way home. Place was empty (well, except for the poker game in the back room...

...so the BAR was empty), so I was just hangin' and talkin' with the guy, nothing else to do (place was already cleaned up, my other "job").
Bar owner comes over to me about 10 minutes later, tells me that we're shutting down, to get the guy's last order and button up.
I ask the boss "Really? Closing???", and he replies "Yeah, tell him to get his last one and head on out.".
What do I know? Maybe we ARE....

....so I go over, apologize to the guy, tell him the boss has told me we're shutting down, and it's last call.
Dude nods, smiles, thanks me, says not to sweat the last call, he needs to head home anyhow, finishes up the drink he's got, leaves me a couple bucks for a tip and heads out.
So, being naive, I begin to do what I think is "closing up". Boss comes out, and asks what I'm doing...closing up, right boss? Nope, just get ready for the shift change....
...I go home at 7, sleep until 3 or so...wake up...still thinking about it....
...4 pm, I head in to the bar, walk up to the owner who'd just gotten there, and told him he needed to find a new 11-7 bartender, I don't work for chicken $417 liars, biggots, or racists. No, I'm not giving my "notice", I'm QUITTING NOW, right now, m**********r.
I've seen it work the other way as well:
In my present job, I had a local guy that at one time worked in our shop, prior to my being there, call and ask about buying a set of replacement Bartolini pickups for his bass. I asked the boss how to price him out, got the numbers together and waited for him to show up. He didn't work for Roscoe long, a few months, but we accommodated him pretty well on pricing because of his association. Understand he did not ask for a price on the phone, just asked if he could get them, then said he'd be by to do so in a while.
He shows up with a friend and the friend's kid in tow, about 2 hrs later. I give him the price, which was VERY reasonable, and he began arguing with me about it. I explained that I was merely giving him the number the owner had instructed, and further that it was far below not only what he would pay at retail, but lower than a retailer would pay to get the pickups (specifically: our cost on the pickups, plus what the pro-rated shipping would be).
He immediately thereafter made this statement:
"You're only overcharging me because I'm black!"
What???
I told him that we were finished talking, and that he was welcome to go buy the damned pickups somewhere else.
Racism sucks, no matter what your skin color is. Using racism as a weapon is as unconscionable as being a victim of it.
