Well, that was food for thought. I'll give you that.
But after such thought, I still have to make the statement that I can't agree.
To your question of "why," I'd need more psychology training than I have (I've taken plenty of Ed Psych for my current career and plenty of criminology for my former one, but not a lot of general psych) to know, much less explain.
Innuendos and implications are always subtle, and they're perceived through the lens of the listener more than the mouth of the speaker sometimes. All I can say is "when I listen to what she said and compare it to what I'm hearing all around me, this is what it sounded like."
As to the possibility that you've lived a sheltered life, the reverse may be true. I may be seeing through an abnormally harsh lens. My experience may not exactly be mainstream. I grew up a member of the token white family in a neighborhood where being found guilty of being white basically carried a summary death sentence if you were on the wrong street, while all the while the media was telling me "you're white and you have it easy. You don't know what these poor unfortunate minorities go through." I didn't particularly care if this person or that one was black, but I did grow up acutely aware that the reciprocal was not always true, and I had precious little sympathy for anyone who tried to tell me I was some kind of cultural elite who owed something to the people who were shooting at me for the hardships they had suffered. My question was always "what hardships? I'm the one who has to watch every step he takes or word that he says."
The mentality which you summed up as the "honkies need to die" attitude was simply the way of the world, and it didn't matter who did what to cause it; all that mattered was I was the one who was going to die for it if I walked down the wrong street.
When I became a Corrections Officer later, and then a Patrolman, I encountered the same mentality over and over. More than half the homicides I was called to were cases of someone being shot on the grounds of "shoulda kept yo' white @** outta our hood." Executed after being found guilty of being white. I have a tough time buying the "the shooters must have had some kind of reason; it must have been retaliation for some kind of racial discrimination they experienced" line, especially given how many of the victims were children. What racially discriminatory act has a five year old girl committed that gives a 22 year old man legitimate grounds to shoot her? I don't see it, and no one else on the Force I served on (most of whom were black, by the way; the demographics of a Police Force tend to reflect the demographics of their jurisdiction) did either. We had families who lived in that neighborhood, and our job was to round up the ones who were making life dangerous for those families and lock them up, as my Chief always said, " 'til they get a prescription strength dose o' Get-Right in their system." To use your analogy, the boat was taking on water by gallons per second, and everyone with a badge was trying desperately to plug the holes, and far too many of us ended up being full of holes ourselves as a result.
With all that having been said, is it possible that I'm seeing a mentality (the rampant desire to kill anyone found, as I keep phrasing it, "guilty of being white") lurking in every nook and cranny that is actually rare? Possible, yes; but it doesn't look that "rare" to me. It seems to be all over the place. Is it possible that I'm reading into her ill-chosen words and seeing a message that wasn't intended? Possible, yes.
But from my experience with the world, what she said, sounds like what it sounds like. And at the end of the day, that's really all I have that I can go off of.