In relation to the 'PC' concept, Apple's guidelines for apps (which I've come across in an article on the 'Infowars' app being removed from Apple's platform) are surely accurate:

The first clause of those guidelines explicitly rejects content that is "defamatory, discriminatory, or mean-spirited content, including references or commentary about religion, race, sexual orientation, gender, national/ethnic origin, or other targeted groups, particularly if the app is likely to humiliate, intimidate, or place a targeted individual or group in harm’s way."