My one Facebook friend who is a bona fide Trump supporter is fixated on the idea that Democrats, and particularly Bernie Sanders, are trying to buy votes from the American people by promising a bunch of "free stuff." It is a bit of a reprise of the "Obama Phone" ridiculousness from the last election.
The funny thing is that Bernie isn't really promising anything free. His proposal to make colleges tuition free and single payer health care is really about raising taxes to pay for extra public benefits. (See point #6 here and the info under the "The Plan Would Be Fully Paid For By" heading here), and Sanders is openly proposing raising taxes to pay for those programs. You can argue whether any of those plans are a good idea, or if they could actually get passed, but they are not an example of promising the public something for nothing.
You know who is promising free stuff to the American people for literally nothing? Donald Trump. That's what is ridiculous plan to build a wall along the Mexican border and have Mexico pay for it plan is.