FF. Libertarianism is a uniquely American form of anti-authoritarianism that I would support.
Fixed.
If you think that letting your boss do whatever he wants to you while you're on the clock is 'anti-authoritarian', then sure. But you just have a weird definition of what is and isn't authoritarian, in that case. Libertarianism is nothing more than inverted Marxism.
You don't have to work for that boss, you can go work for another boss, which puts that guy out of business, which fixes the issue. While a genuine free market would probably need some restricts on the creation of monopolies, the issue can be fixed without resorting to massive government involvement. Ideally the government checks corporate power and the people check both.