Again, mortified!
Said something sweary and a little rude (because that's the way we talk to each other) only to be told that her parents were also in the car and I was on speakerphone!
Apparently her bluetooth connects to her car so the speaker comes through the radio or something.
What is the speakerphone etiquette?
AIBU to expect to be told that I'm on speakerphone and that X and Y are also present.