- Yes, the US has a police brutality problem. (Though not near as bad)
- Yes, the US has a government corruption problem. (Though not near as bad)
That acknowledged:
* At no point will you disappear in the US for criticizing the government.
* At no point will you be placed into a concentration camp and tortured.
* At no point will you be barred from participating in society because you lost points on a "social score" calculated on things such as following the wrong religion or criticizing the government.
* At no point will you be subject to ethnic cleansing.
* This list could be many times longer.
The US is not a totalitarian police state and it is fundamentally dishonest, to the point of mendacity and/or trolling, to equate the two. There are no countries on this planet with entirely clean hands. All have committed abuses, all have fallen short. With the binary 1 and 0 off the table, that leaves us with a matter of degrees, and some countries objectively have worse human rights records than others.
On top of all that, most of the posts like the one you quoted amount to whataboutism, or the tu quoque fallacy. This is an ancient trope. Soviet-era Russia tried it[1] too. The response to "China puts people that disagree with them into concentration camps" is not "But the US..", or "that's not fair because.. (it's not as if these accusations are unsubstantiated by fact)", the answer is "that is wrong and should be condemned".
[1]: https://en.wikipedia.org/wiki/And_you_are_lynching_Negroes