I Dont Like Cussing

Proper manners is the way to go but people DONT listen to me or anything else. Even when my friends and I are hanging out they swear so much I am just applaud and astonished. I told then to stop cussing. My friends say, "Our parents aren't around and people cuss and would you live a little? And we don't need to be lectured!" I hate cussing and one of my friends said, "If you can't handle cussing then don't hang with us! The problem is you're overly nice and you're too passive and it's annoying!"