From the Library of Congress, 1919.
What Will Mrs. Thompson Say?
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You should thank the other boy for his opinion but tell hiim you can make up your own mind, and please don't gossip.
You should tell your boyfriend not to curse in front of you, it demeans him and makes him seem less polished and not as high-quality a person as you see him to be (that should get him, appeal to his ego, but tell the truth). Cursing is uncouth and also makes him seem less articulate.
Good luck getting him to stop, though. If he won't stop, you may need to consider not seeing him any more.