One thing I’ve learned is that the people you were scared to swear around were also swearing when you weren’t around. When I was about 20 or so I was around my dad in his natural (work) environment for a few months, and I learned he cussed like it was breathing, after having tried to keep me from ever swearing. My late father was one of those parents who would be harsh on his kids for swearing and for saying bigoted things. The moment he would get stressed out driving he would light up with curse words and racial/ethnic pejoratives.