What? Not even remotely close. John D Rockefeller was shrouded in wealth about 100 years ago. If you think the poorest, homeless person now stuck on the streets lives better than Rockefeller did, you're confused.
Do not conflate general human progress of what's available with more knowledge, science, and basic technology with what a time period normalized standard of living looks like. You can't attribute economics directly with progress (it is a factor but not the only factor), otherwise you could very easily make a valid argument for an authoritarian government and economy like you see in China. China is arguably just as technologically advanced as the US.
Now your middle income American might be considered as living better than Rockefeller depending on how you define quality of life. They have all the essentials they need to survive and access to more progress than Rockefeller did during his time period. They also have significantly less free time and less resources to explore the current space of possibilities whereas in the early 1900s, someone like Rockefeller had access to anything they wanted to do during that time period.