The numbers are irrelevant. Just because WWII was so deadly doesn't mean you should trivialize Vietnam and other conflicts. It's ridiculous to call it a "small policing action to keep dictators in line" when over a million people were murdered in a war of aggression, propping up a dictator against a popular movement.
Of course, only the Americans matter, right? Let's focus on those poor soldiers who went off to another continent to massacre villagers and sometimes got shot, and completely ignore the million villagers who were massacred and had napalm and agent orange dropped on them.
But it's fine! The Nazis killed more civilians, so, you know, from then on literally nothing less than the Holocaust ever matters, right?
That's the real meaning of "Pax Americana" right there. The US will come to your country and slaughter people en masse and leave it in rubble using chemical weapons that last for generations, and then they won't even recognize it as a significant conflict because it was primarily your people who died, and only Americans register as human to them. Perhaps later they'll come by to film a movie about how killing you made them feel sad.
Sorry to burst that bubble, but just because you were never taught about the things they're talking about doesn't mean they didn't happen.
It just means your education system, like most, is run by nationalists that care more aboutv using mythology to make more nationalists than about conveying historical fact.