For a lot of these young liberals, Trump winning was the first big disappointment in their lives. These little Pablum-pukers were babied by their parents all their lives and are used to getting everything they want, even if they have to cry and throw a tantrum for it.
They wanted a Hillary presidency more than anything, and they didn't get it. So they reverted back to what they know - throwing a tantrum until they get their way.
Only this is the real world, and democracy doesn't give a fuck about your tears, so their tried-and-true method failed to yield the desired results, and it fucked up their brains.