That's complete and utter nonsense. Capitalism works on slave labor plain and simple. The reason everything is made in third world countries is because they have no worker protections. Your clothing is made by some kids in Pakistan, your phone parts are made by suicidal workers at Foxconn, and so on. This is slavery in anything but name. Any countries that don't want to play in this system are systematically destroyed by US interventions. Just look at the history of South America as an example. It's a continuous stream of brutal coups and dictatorships instigated by CIA. Even domestically US now has a huge prison labor force that's become its own economy. You likely never experienced any of this personally, and never really wondered about the human cost of your lifestyle.
A rational person would understand that a system where 1% of the population owns 99% of the wealth is not working for the common people around the world.