Yes, we are moving towards more political correctness, but I think this is a good thing, in general. People should be polite in public. Rude people occasionally deserve a punch in the nose, but our society doesn't allow for this either.
Not trying to off topic here, but there is a difference between politeness and political correctness. Most people (in America) are generally polite (except while driving, for some reason). They hold doors, say thank you and please, smile when passing by and generally respect your area of space. I can't say the same thing about other countries. I think the major difference is that Americans respect personal space. Canada is great at this as well.
Political correctness implies that there are disadvantaged groups in America and we should treat them differently (softer) than others. It's really unclear what the disadvantaged groups are because they're growing by the day, and asking for more information about what someone's disadvantage is could be viewed as a micro aggression or "concern trolling." From what I know about life, there are no disadvantaged groups in America, at least not for a long time. Every single person has triggers that make them laugh and cry, and if you find them, you'll get your intended reaction. If we're trying to build a society of vocal equals, telling the collective that certain groups have additional rights is not a good way to start. It also creates incentive to join a disadvantaged (read: victim) group so that you can claim that you are offended anytime things don't go your way. Being from immigrant parents, I could easily qualify to get thrown right near the top of the victim scale, but I have too much self respect to ever consider myself a victim.