Dear Queenie,
A person I have been friends with since I was a child uses a lot of bad language, including the “F” word. They also have a very loud voice and it’s embarrassing to be with them in public where everybody can hear them.
Queenie, how can I tell them how much they embarrass me?—Their friend
Dear Friend,
Tell them just what you just told me. You will be doing them a favour, so do not feel badly about what you are telling them.