Pretty pathetic "hit piece", as usual.
I absolutely guarantuee you that the percentage of self-identifying Libertarians agreeing with the premise is higher than among US "liberals". Of course, this does not fit to the video creator's agenda. The video never shows people identifying themselves as "liberals" but just claims they are because they share a specific point of view on a single issue.
23 percent of California's registered voters identified as "independent voters" in 2016. Johnson and Stein managed to get 5% of the votes in California, which is slightly better than their national results.A young Libertarian? In California? Wouldn't that be like finding a 4 leaf clover or a unicorn?