Political Correctness is defined as "the avoidance, often considered as taken to extremes, of forms of expression or action that are perceived to exclude, marginalize, or insult groups of people who are socially disadvantaged or discriminated against." The term, "political correctness" was termed the soviets in the late 1920's to explain how those within their system needed to be brought into the fold so their beliefs matched those of the party.
What does this mean?
First, if one perceives that someone is excluding, marginalizing or insulting them or others, they can sue or raise societal pressure against them. Perception is largely personal and totally bias in many cases. That makes it a weapon someone can use to their advantage.
Second, political correctness is the brainchild of a communist regime. That means it has no place in a free society. If you think something sounds good, always consider the source.
Consider this quote, "As a Christian I have no duty to allow myself to be cheated, but I have the duty to be a fighter for truth and justice." Sounds like something every Christian should feel good in believing, right? The speaker was Adolf HItler, not the world's greatest role model.