The American patriotism thing is not a problem per se; it is just another evidence for trolling. If it was the only suspicious thing in the comment, I would just skip it as a cultural difference.
Also, there's a possible reason to use those three colours to symbolise freedom that has little to do with American patriotism. (Not that it's particularly better.)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.