Politeness and political correctness are nothing alike.
In my experience, "Political Correctness" is rarely used by the oppressed to any advantage, it is far more likely to be used by one of the privileged to attack another one of the privileged for their own gain. The underlying issue gets no attention and instead the person who used the wrong word becomes a target.
Political correctness seems to be the liberal equivalent of the conservative religious appeal. It simply easier to motivate people against something trivial than it is to motivate them for something complex.
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In my experience, "Political Correctness" is rarely used by the oppressed to any advantage, it is far more likely to be used by one of the privileged to attack another one of the privileged for their own gain. The underlying issue gets no attention and instead the person who used the wrong word becomes a target.
Political correctness seems to be the liberal equivalent of the conservative religious appeal. It simply easier to motivate people against something trivial than it is to motivate them for something complex.