I'm not sure I deserve to be called churlish, since I was neither vulgar nor particularly difficult with that comment. And my comment was actually intended more as a good-natured tweaking of something I think you would agree with me on, vis a vis your own nation.
I do, however, find it bit ironic that nations with their own history of racial or ethnic strife are acting as if the U.S. was somehow uniquely in need of absolution in this area.
