Plenty of Vikings sank too. The ocean is mean. And we can totally build a pyramid, the only challenge we’d have is getting the funding and permits. Outside of that it’s just moving rocks, we can move rocks real good.
I suspect the poster meant building a pyramid the same as the ancient Egyptians did - sans modern technology.
Then moving rocks becomes not so easy.
Actually, a team tried to build a tiny replica of an Egyptian pyramid a few years back for a documentary. If I remember right, it was intended to be about 30 feet tall, versus the 455 foot height of the great pyramid. They initially attempted it using only the skills and techniques they believe the ancient Egyptians had available and they failed miserably. So they brought in heavy equipment, including a crane, and were finally able to complete it, but it looked like a joke in comparison to any part of the real thing. And their tiny version was just a pile of carved stones, without any of the intricate internal passages and rooms of the real article.