Its a different US out there today. I shake my head at the frequent indiscriminate use of the F word. Of course, I drop this word very infrequently with my buddies, but I never do this around my wife, children or Ladies and strangers. The Army was a whole different matter all together.
I remember my childhood from the 1960s, and my beloved step-father who never swore—at home. But he was a mechanic, well known at dozens of garages, and would always take me with him on Saturdays as he made the rounds at various garages and then bars!
Anyway, at the garages and bars (with no ladies present—a few had female bar tenders) it was f’n this and f’n that all the f’n time!
I learned the word and all its nuances by the time I was 7! However, he never spoke it at home or in mixed company (female tended bars) and I learned the same.
He never told me this directly. It was just something I observed and did the same.