The Romans couldn't build a pyramid. Checkmate, archaeologists.

Feels very racist. They assume Romans were better at everything than all other civilizations of that time period.

That's the crux of white superiority racism in the west. Romans are elevated to a near mythical level of advancement by people who can't do trig. That "advanced civilization" idea is then applied to human rights problems like slavery and libertarian ideas like Crassus' fire fighters. Racists are also notorious for not thinking shit through and that short term planning problem is why they never actually succeed, they just fuck up shit for others and then die.
The pyramids were built over two thousand years before the coliseum. Saying they are of the same time period is like claiming the Eiffel tower and the coliseum are of the same period too!
And as we know, Egyptians and much of the Ancient Semitic lands were advanced. All those empires didn't fail because they were stupid societies, it was usually conquering armies, plagues, or a string of terrible leaders. The sciences held strong though, especially leading in mathematics and astronomy up until only recent—relative to how far back were looking.
- Ancient Egypt specifically fell because of Rome, but it had a much better time at the early middle ages than a lot of other former roman provinces.

The difference between "How did they do it?" and "How did they do it?"

This means that with the same energy used to reassemble a taco that's cracked down the center, if I had wanted to unclog the downstairs toilet, it would have taken me between 184 and 400 years. If I had been deprived the use of lettuce, cheese, tomatoes, ground beef, and everything I showed the plumber that I said the plumber could not have, I probably would not have been able to unclog the toilet until I move out 6 to 9 months from now. So, it is clear that no plumber could have unclogged my toilet. It is a project that given the tacos available by the time it got clogged would have taken several generations of plumbers to complete.

If the plumber working in my bathroom while I ate chips could not unclog my toilet in 40 minutes, then no people in that downstairs bathroom could. So who unclogged it? And when? And do I still have to pay?

The Colosseum was just a stadium. A pretty one, but really just a big building among other big buildings. The great pyramids were the effort of a whole nation. They're the Delta Works, the ISS, the Panama canal, the Three Gorges dam. The Colosseum the equivalent of Michigan stadium...

You commented some really cool things, and then mentioned the 34th biggest sports venue (3rd largest stadium).what's significant about Michigan stadium?
- The point is: Michigan stadium is not on the same level as those other constructs. This Facebook user is doing the equivalent of "It took 5 years for my city to approve permits and build a new library. Extrapolating from that, it should have taken 400 years to build the Hoover dam. Aliens must have done it"
- I looked at biggest stadiums on wikipedia and then didn't count the one that closed (#1) and the one in North Korea (#2).

I honestly just feel bad for these people.

The awesomeness of these achievements by the ancient Egyptians/mayans/chinese, the awesomeness of paleontology, the awesomeness of the Grand Canyon, mountains, oceans, evolution, the internet… they will never really appreciate the beauty of the world, man made and otherwise.

Well it mustve been aliens then. Checkmate

I would love to convince these kinds of people to build their own Pyramid but out of concrete so they can prove everybody how right they are about it.

Kind of like how my answer to flat earthers is to just have them go and lower GoPro over the edge and tell us how that goes for them.

It's okay though, they'll come up with some excuse to why they can't go do it.