When people realize and notice that they have cussed in my presence, they apologize to me. Is this an indication that I am pure and virtuous?
-- It certainly indicates that their impression of you is of someone they feel respectful of. If you actually are pure and virtuous, then it's coming through. You should be proud of how highly someone must regard you to apologize for being vulgar. You may politely respond, "Thank you for that apology, it means a great deal to me that you try to curb such crass language" This is not only acknowledging their effort, but encourages them to be more aware of their speech so that future apologies are not necessary. It is embarrassing these days to hear foul words not just from gentlemen, but ladies often lack the decorum that would keep their own expressions in check. Thank you for asking for me on this one. I am honored!
Formal event coordinator/officiate, announcement author