Sounds like something a manager would say. Some of us produce, create value through our labor, while some sit their fat asses at a desk and only grace the production floor to make everybody's day just a little more difficult. So you just get on back up there to the big house and let us handle things out here where you can't hack it.

Everyone manages something.

Most workers manage something and create value. Managers are only managing, remove them and nothing changes - usually things get more optimized, actually.

This is too facile. First, in terms of capability maturity, management is not the goal of a fully-realized line of industry. Instead, the end is optimization, a situation where everything is already repeatable, defined, and managed; in this situation, our goal is to increase, improve, and simplify our processes. In stark contrast, management happens prior to those goals; the goal of management is to predict, control, and normalize processes.

Second, management is the only portion of a business which is legible to the government. The purpose of management is to be taxable, accountable, and liable, not to handle the day-to-day labors of the business. The Iron Law insists that the business will divide all employees into the two camps of manager and non-manager based solely on whether they are employed in pursuit of this legibility.

Third, consider labor as prior to employment; after all, sometimes people do things of their own cognizance without any manager telling them what to do. So, everybody is actually a non-manager at first! It's only in the presence of businesses that we have management, and only in the presence of capitalism that we have owners. Consider that management inherits the same issues of top-down command-and-control hierarchy as ownership or landlording.