Why is it that I can go ten years without hearing a single person swear around me?

I have friends who swore when we first connected but after a month or so, they stop swearing around me. Nobody ever swears around me. When I was in school, I went 5 years without hearing a single person swear around me. I also went 5 years without seeing a single person smoke weed, smoke, or talk about doing drugs or cigarettes around me.

Why is it that I can go ten years without hearing a single person swear around me?
Post Opinion