Right yeah, the US is a world leader. This would be the US that still _murders children_ and calls that justice. The US that runs an illegal torture camp and says it shouldn't need to try people in court to find them guilty, because it has "proof" they're guilty, it just can't show that to anyone because it's secret proof.
The US where cops can take anything they want, and that's "lawful seizure", kill anyone they want and that's "self-defence", but it's OK because there's "due resistance" in the form of crazy people with guns causing even more murder but they're "citizens" so that's all right then.
Both you and the grandparent can be correct at the same time. The US government does have a rather poor human rights record. It's not much better than a large majority of the world's governments in that regard. Some state governments within the US have taken liberties that do appear to run counter to the Bill of Rights — and the courts are still examining that.
You should also consider, however, that the US government still does not have legal powers that other "free" countries' governments take for granted. (The most glaring example that comes to mind are the omnipresent surveillance cameras in "free" Britain, but you're free to look around and see other problems in other countries.) The Bill of Rights still holds some power and curtails the right of the government to curtail citizens' rights.
So you are correct and the GP is correct, and at the same time.
Get over yourselves. You're a backwater that thinks because it diverts most of its resources into military might that makes it morally superior.
Well, except for that. That's your opinion, which in the US you're free to have, but lets keep the discussion focused on facts. The only fact is that the US does spend a lot on the military. You don't even know if the GP is from the US.