There's a ton of people that, for some reason, just can't grok that humans have been largely behaviorally and biologically identical for the past 200k years.

The average ancient roman plebeian's life would not look dramatically different from ours today, minus technology of course. They worked a day job, ate at thermopoliums (basically fast food), lived in crowded apartment complexes with various forms of slum lords, deal with high rent prices, and roman graffiti is littered with complaints about politicians, sports teams, and the rising cost of living.

With the pyramids, we have the Wadi al-Jarf papyri, a detailed logistics logbook documenting the teams moving the stones for the great pyramids, along side payroll records much like any other spreadsheet you'll find on someone's corporate computer today.

We are not so different from our ancient ancestors at all.

Ancient Aliens conflates two very different ideas.

The show’s core argument is that ancient civilizations were more advanced than we give them credit for. That may be true, but “more advanced” does not mean they had superior technology or help from aliens. It can simply mean they had technical knowledge, methods, or craftsmanship that we have since lost or forgotten.

Elon Musk has made a similar point about the US space program. We landed on the moon more than 50 years ago, but in some ways we now have to relearn how to do it (because we forgot how). That does not mean we had better technology in the 1960s, and it certainly does not mean aliens were involved. It means knowledge, systems, expertise, and institutional capability can fade over time. And that doesn't mean aliens were involved (as the tvshow would make you believe).

It's more specifically "I personally can't conceive of how one might built this, so non-white people definitely didn't build this"

This is a strawman argument, their real one is: "These megalithic structures would be tremendously difficult for anyone to build even today with all of our modern technology, and yet they did it hundreds of times before even inventing the wheel, in several places across the world."