What conversations! What vulgarity and what dirt! And you have to associate with them, in the office, in the university, in the operating-theatre..., in the world.
Ask them if they wouldn't mind stopping, and they laugh at you. Look annoyed, and they get worse. Leave them, and they continue.
This is the solution: first pray for them, and offer up some sacrifice; then face them like a man and make use of the 'strong language apostolate'. The next time we meet I'll tell you in a whisper a few useful words.