In reality capitalism is one of the most authoritarian systems in history.
This statement is pretty disingenuous. First, authoritarian is a political system, not an economic one, but for the sake of argument let's call authoritarian "the lack of personal choice or opportunity". I feel like this definition captures the sentiment of the original post.
Don't get me wrong, there are many flaws with the inequalities of capitalism, but it does provide much more freedom of opportunity than feudalism and substance farming in terms of economic systems. Those two have been the staple of civilization since its inception. Personally, I would choose the system where the deck is stacked against me, rather than the system where I don't get delt a hand.
So no, I don't think capitalism ranks as one of the most authoritarian systems in history. There are many changes we can make to reduce inequality and make the world "less authoritarian" though. Might be a better to push those ideas of improvement rather than pretending that we live in the worst time in history.