White people who twice voted for Obama put Trump in the White House. To call it a whitelash is very ignorant, (not to mention, Blacks and Hispanics voting for Trump more than Romney). It was a backlash against globalism, the status quo, and a corupt political establishment, all of which Hillary represented.
To deny the inherent racism that Trump represents is to be worse than ignorant; it is to be WILLFULLY ignorant. You have to have your head buried deep in the sand. The man launched his political career on racist birtherism, then doubled down on racism (some dogwhistled, some blatant — “globalism” itself is a xenophobic dogwhistle by the way) at every turn. Believe it or not, it is possible to vote for Obama and still be racist or just incredibly ignorant (possibly racist against Hispanics/Muslim immigrants more than just black people too) so the fact that Obama-Trump voters existed doesn‘t mean anything. This “reasoning” is as shallow as “I have a black friend, so I can’t be racist.” Basically the entire Trump platform boils down to: “Vote for me or ‘they’ will take your jobs, rape your women, drug your children, take over the country and outnumber ‘you.’” And that inherently racist rhetoric appealed to angry whites who turned to him in backlash, including outright white nationalists like David Duke and other “very fine people.” They sure as f—k heard what his real message was. Trump won because he fired these people up and the turnout for other groups was depressed due to Obama not being on the ballot and yes, Hillary not being a great candidate. It was still just enough to win, but it nonetheless was enough. And we wouldn’t have seen such swings in predominantly white states if Trump’s white identity message (which again was what his whole message, “globalism” and all, boiled down to) hadn’t resonated so well with them. Again, studies have demonstrated this incontrovertibly.