That's the fallacy of equivocation, and yes, I see it all over the place. It's a form of sloppy thinking, and it's growing worse. I think there is in fact a conspiracy (not secret--they're working out in the open) to ruin public education and purposefully create citizens whose thinking is sloppy. I am a philosopher working mainly in the analytic tradition (though lately I have taken an interest in some Continental ideas), and one way to think about what analytics do is strive to eradicate all trace of equivocation in reasoning. I make a point to teach an intro undergrad course at least once a year, and I see it all the time in those classes. Students coming out of our high schools--even the ones able to get in to my university (which shall remain obscured)--just cannot think. I have to undertake to teach them--which is why I teach intro classes, even though we have plenty of grad students able to fill that role.
There is, no doubt. There was a lot going on around that time. We were emerging from the 2008 recession. Obama had not lived up to the promise of his campaign. Of course, there were racist elements who hated the fact that the President was a black man. Unbridled globalism, which had taken a blow in 2008, got underway once again. There was a lot of rhetoric that Washington was just too corrupt to continue as it was/is (with which rhetoric I mostly agree, BTW). The wars in Iraq and Afghanistan that had seemed to be dying down had surged up. The iphone and other smart phones were catching on, and big data started to go...well, big. Gabbie Giffords was shot. Standard and Poor's downgraded its rating on U.S. Government credit. We got Bin Laden. The Occupy movement got some traction. Etc.
It's not easy to fully diagnose what happened just now, as more time would need to pass. But I think that Obama was elected with the idea that he would be an outsider who would blow up Washington with more liberal policies. When he turned out to be a centrist who supported the same policies and protected the same individuals (members of the economic elite) that had been gutting America for so long, there came a lot of anger. He won reelection for a number of reasons, but when Trump came along, the same motive that had elected Obama the first time came back with even greater urgency.