don't worry, these are people who make assumptions based on what they think they know, not by what's real.
Anarcho-capitalism is in no way authoritarian as it is against force. Force is what makes something authoritarian.
It also isn't pro-corporation above individual rights. When the red avatars learn that individual rights and business rights are aligned together against government. Not government and individual against business, they could then undertand that it is government that elevates business to the level where they could become monopolies. The only way a monopoly can exist is by means of government.
I think you're making an assumption based on what you think you know...you seriously don't think monopolies can exist on a free market? Do you have any idea whatsoever about the functioning of markets?
A monopoly isn't really a monopoly unless it can't be dislodge by legal means. A natural monopoly only occurs becuase one company is more efficient than all its cmpetitors.
So, let's assume that a company owns a subway system in a city. How am I to compete with this company exactly? Build my own subway? Where? Or say that someone owns the road outside my gate and makes me pay a very high toll. How do I compete with him? Do I build my own road on stilts above his and climb onto it?
Free markets work in an excellent manner as long as the cost of establshing a business is sufficiently low. When it becomes really, really high you get trouble. Infratruscture is the most obvious example here. Of course, yes, there is a difference between a legally protected monopoly and one that just exists, but the bad effects can be there. If the cost of establishing a competitor is too high a company can keep and acquire a monopoly without being the most efficient player on the market.