Democracy is a system of government. It asks people to vote on important decisions (like brexit) and to choose leaders to make day-to-day decisions on their behalf.
It is, of course, the system favored in the West and evident touted as the "best system".
Being 'best' of course does not necessarily make it good. Large groups of people are easily swayed based on fear, anger, perception, rhetoric and so on. The implications of each policy are seldom evaluated in the cold light of day.
So yes, the British voted for brexit- that is democracy in action. Majority Rules - so whining about being in the minority is irrelevant - the system is literally based on "majority rules".
Same thing in the US now. A president has been elected where he has specific points of action. The majority voted for those points of action. The people have spoken. Those policies are not secret. They have been publically explained to anyone who cared to listen.
It's not necessary to blame foreign agents. The decision lay with the electorate, and the electorate have spoken. It is the very core of democracy that those votes be respected and acted on. Uou want to leave Europe? Fine. Is it monumentally stupid? Absolutely. But democracy does not require "good" decisions, only popular ones.
And before the US folk get smug, tarrifs are coming to drive up prices. That is quite literally what the people have voted for. I have no doubt this will reinvigorate the local manufacturing industry. The next VC target will be steel.