People are using political correctness as a excuse to not face there problems. there are instead employing these "safe-spaces" as a means to hide the fact that they have there own deeper physical and emotional issues that they think they can ignore.
Political correctness is not simply about choice of words. Language affects thought. Thought rarely changes on its own. Thinking consciously about our words is a method of making the brain understand a different viewpoint. This makes it worthwhile.
No, it doesn't "threatens" society. The problem with political correctness is exactly it's profound uneffectiveness in threatening the bourgeois society.
I say we substitute it with a people's revolution and direct democracy, with nominal economic equality to everyone.
"Nominal economic equality" means that your work won't be valued accordingly to anything else than itself. So women don't receive less than man, black don't receive less than white and you cannot force someone to make money for you. But the most important is giving everyone a chance in life by improving education and making sure everyone can get a job, if they wish so.