Shouts like "all opposition is nothing but la la land anti establishment nonsense and all the same" ignoring the contexts, ideologies, aims and strategies of said movements is exactly why liberalism will learn nothing from this and continue as it has done, sheltered by its own smugness and blaming everything but itself.
People did not vote Trump because they were sneered at, as I pointed out yesterday, the poor and 'uneducated' rejected Trump. It's always assumed it's the working class who are responsible, it's the inbuilt classism of smug liberalism that assumes any rejection of it is from angry and/or stupid people. Trump was voted in by middle class white people upset the world doesn't quite revolve around them as much any more.
Liberalism is why we now have an open fascist heading to the White House. It refused to sneer and shout down fascism and so alongside fascism it should be sneered and shouted down itself. As the reactions to Sanders and Corbyn shown, liberalism has no problem doing it to even mild social democracy, but when actual fascism re-emerges, liberalism wants to give it a platform, to listen to its 'genuine concerns', to move rightwards and try to meet it in the middle. And Trump, brexit, Farage, Le Penn etc are the result.