James Shelley has a series on political correctness that's worth a read:

Political Correctness, Objectively Speaking
Political Correctness, the Proxy of Politics
Hate Speech and Jokes
The End of Political Correctness

At some point we will find ourselves forced to return to the elementary questions and first principles behind all this PC banter: what is the state for? what is the nature of liberty? what is my responsibility to you? what does it mean to be a neighbor? No matter which 'side' of the PC debate you are on, these seem like the truly critical questions.