It's a no brainer to note the difference in vernacular between the blue and white collar classes. That's not to say that some of the upper class can't swear like drunken sailors but it's far more likely that the working class will be prone to profanity.

I've been in the construction industry for over 20 years and can swear with the best of them when necessary but 'fuck', 'fucking' and 'bullshit' are so commonly used they're spoken without thinking.

I worked with an older man that never swore and that always impressed me. He could express any negative emotion without using the crutch of foul speech and because of that, I had an added respect for him and tried with limited results to emulate him.

Most of my colleagues are aware of the language they use and can turn it off in situations like dinning in a nice restaurant. On the flipside, you'd see the opposite behavior in a tavern where the floor is covered in peanut shells.

But why would you want to "turn it off"?

It's not just a matter of self-respect but one Of "class". Class in the sense you have confidence in yourself but aren’t arrogant. You’re aware of those around you and are considerate of their possible sensibilities. In other words, you practice common courtesy. Mostly you make the people around you comfortable. You can practice speech with class whether you’re a Bill Gates type, or a struggling construction worker. It does make an impression.