… right, “Archaeopteryx” can fly, but not all “dinosaurs” can fly. That distinction is crucial.

In an entirely different manner, “dinosaur” != “theropod” bc the former is a common word, an unscientific one, whereas the latter is a more precise one. If you had originally asked me are birds theropods, I would have been forced to say yes (entirely unbegrudgingly though, I’m just emphasizing how I would have no choice), but that’s not what you asked: you talked about DINOSAURS vs. birds, which is an entirely different thing, being in the realm of common use of those words.

Anyway, I agree that it is good to learn more about things, and as we do, we become better ourselves.:-)