Overall, your concept of people being too politicaly correct is a valid point, and also a valid point is when posters get worked up about a single word that doesn't make a difference. I often find people do this so they can avoid the rest of the post, which is just plain stupid.
However, there has to be some sort of political correctness. For example, it simply isn't appropriate for the president to refer to a black person as "ni**er" or a Jew as "kike" or a homosexual person as "fag" or a Muslim as a "Muzzie." It simply isn't right.
That said, when I think of political correctness, I find that it is a far worse - and much much more serious issue - in Europe, where previous colonialists and racists try to make it as though they're angels, and feel badly about their ancestors' racism and Social Darwinism, so they tolerate everyone, including mass murderers. It's so bad, that in places like Norway, you can have 300 rapes in 6 months, but because a certain group is doing it, it will be barely reported. And when it is, they'll say the blame is other people's fault.
So yes, you are right, but I find it is taken to the extreme in Europe/EU, and is far worse than in America.
Just my opinion.