that's generally a bullshit rationalization from people who simply haven't learned workplace communication skills and mistake their own obnoxious aggression for brilliant insight and truth telling. 90% of the time, imagined "bold free-speaking" tends to be banalities.
No, it is flouting them that is generally a sign of cluelessness and lack of awareness of why communication norms exist. It has almost nothing to do with politics.
"Political correctness" used in this context is a dead giveaway that you don't understand how offices work.