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So if the universe is flat does that make the earth flat as well? :-D

It's a matter of perspective. It is certainly not flat from the perspecticve of our 5 basic senses.

I’d say our 5 basic senses that have a very limited reach would claim the earth is flat. Of course it is not flat though (just to be clear).

Not if you're an astronaut or pay attention to the horizons curvature and other simple observations.

I think it is flat in the sense that our 3D space has no curvature beyond the provided by gravity.

Of course this is totally different than saying it is 2D flat. We know this because of cats.