If you're just going to lie, you could at least pick something everyone isn't versed in. As opposed to implying the US has no oppressed minorities, which is by now so well and extensively documented to be the case nobody sane will take you seriously after reading you say it isn't.
It happens on very few of my comments, usually when I'm a bit too forceful while pointing out something that can be construed as politically left-leaning. Thank you :)