I don't think a lot of people on here grasp either why Trump got as many votes as he did nor Brexit, and for the same reasons. Folks aren't connecting the dots between Trump and Brexit and Australia, and Italy, and Hungary; it's all part of the same phenomena, and that teapot was very much a symbol and a harbinger.
A lot of people feel that the *only* entity that should make any sort of rule, law or regulation effecting what goes in in a country should be the government of that country, not the EU, not the UN.
Lots of family and some friends who are Trump and/or Brexit supporters. Nationalism is real, any government ignores it at its peril. Be it borders or trade, there's a huge, instinctive backlash when some outside entity says 'you must do/not do this'; right or wrong, good or bad, something like a government in another country or an international organization TELLING the citizens of a nation will arouse a reaction that people with an internationalist, egalitarian and 'citizen of the world' viewpoint are shocked by.
So I wasn't at all surprised by either Trump's win nor Brexit. And the world hasn't begun to see the crest of nationalism, and won't for another 20-30 years. Just a cynical observation by a very pessimistic progressive.
Maybe I'm wrong, I hope so.