Well... here goes! My pet peeve is the inability for people to have a discussion without every other sentence being full of four-letter words. I spent over 40 years in the engineering/construction industry. Half of those years I was in confrontations with contractors almost daily. The four-letter words would spew rampantly. Many times I told my contractors, "If you ever hear me use a four-letter word, I have a $100 bill in my billfold that will be yours!" I never had to hand anyone that $100 bill. It was amazing how when someone was so mad at you, to let them blow, then calmly discuss the issue... respectfully.
Upon retirement, I taught in a vocational school for a short while. The young folks could not communicate without the use of four-letter words. When I tried to explain how much more professional they would sound and the potential for getting further in their career by using more respectful communication... I was told it was infringing on their right to free speech! The "right" to "f" this and "f" that was more important to them than being able to communicate professionally. Sheesh!
Yep! That's my pet peeve! Rant off.....