Some aspects of political correctness are out of hand, but let's not lose sight of the big picture. Being irritated about "PC culture" is no excuse for forming radical violent militias or taking up arms to terrorize society.I think it is virtue signaling. PC as fashion statement. The quiet middle keep their mouths shut for fear of being shouted down, despite generally being sympathetic.
What generally happens is that these extremist groups have agendas such as white nationalism, or are anti-western liberal government. Those agendas are the starting point. To recruit new members, they exploit these common 'white male' annoyances such as irritation about political correctness, feminism, or too many non-white immigrants. Those are techniques to draw more people into their movements.
This is why I am extremely suspicious of people who are very quick to pivot any discussion to complaints about political correctness / feminism / immigrants. It's part of the right wing extremist propaganda toolbox.
Let's stay grounded in reality here. The major problem our society faces, as a threat to public safety and government stability, is right wing extremism. And no... this didn't happen because of PC culture.