I do try to keep my cussing to a minimal, but sometimes it just slips out. One time before Halloween I was with my sister in a Halloween store, I ran over to Optimus Prime's sword and I was trying to get it off the rack, but it was stuck so I fiddle with it and say, "Fuck!" a LOT louder than I thought I did and there was a kid with their mom around the corner XD My sister and I started busting up and still laugh about it. Overall, I cuss a lot when I'm frustrated (driving and dealing with idiots on the road) or hurt myself (hitting my knee/shin/toe,etc)
Pff people swear constantly around me all the time so I don't even bat an eye anymore. And I and everybody in my family practically cusses so I'm just used to it. And all my entertainment has cussing in it too! Like what the hell's bells? I'll watch it by any means around young kids but heck even they cuss these days! XD lol I still watch it when I'm outside though. Never know what kinda person you'll meet.
There would also be those kinds of people who do swear, but are somehow doing it wrong. Like, when they swear it won't even be the right one to use. I'd use an example but I rather not get flagged. But, it does get frustrating to the point where you just have to tell them "Stop. Just...just stop, okay? Stop cussing, you're not good at it. Alright?"
As an adult, I choose not to use swearwords, because I can find other, better words to express how I feel. And for those who swear constantly, I have no problems if you do, just be careful when you get a job, it might just roll off your tongue in front of your boss!