Like I said above, I wouldn’t swear when talking to ATC. I will happily follow their instructions as they guide me in and out of airports and in and out of gates and runways. I will remain professional in that.
Now, let’s say my fellow pilotalso a friend and I are in the cockpit and our airplane is cruising at FL360. Unless there is something going on, you are basically doing nothing. Now, we get bored and decide to have a casual conversation with each other, talking about life, school, history, inspirations, games, and whatnot. Now, can we swear in those situations and is it allowed by the FAA? That is my question. I could care less about the opinions on here as they are irrelevant.