I witnessed a PAX drop an F bomb once.
I've never raised my voice or threatened a TSO. I have completed screening several times and been steething so much that I had to wait 3 or 4 minutes before I went over to the supervisors area to begin the complaint process...
However, I have also decided that if I'm ever in line and I witness a theft from my belongs or someone else, or if I see a TSA member touch one of my children, I WILL cause a scene and YELL at the top of my lungs demanding a LEO.