I said something admittedly nasty about Mao's policies a couple of months ago, and was threatened with banning due to "borderline nationalistic trolling". Fair enough.
It sure doesn't seem to be enforced in an objective fashion though. More likely, it appears to be more in line with the current fashion of SV: Never discriminate, unless it's against a group viewed as being powerful and bad by West Coast Americans, in which case it's ok. American? That's definitely a way to be cool and anti-imperialist/colonialist. Christians? Even better. Because of all of the regressive religions which preach hate towards gays and deny evolution, Christianity is the one practiced by white people from Alabama, and therefore it's funny and useful to attack it. If this gentleman were an Islamic missionary from Egypt, the above comment probably would never have been made, and if it had, would be removed, with good reason.