That happened to me in high school. I was devastated. I went to my mother's room -she taught there- in tears, she did not flinch. My English teacher was there talking to my mom, and she Demanded to know why I was in tears (because my mother was so non pulsed). I told her; and she stormed out to set the record straight that I just was NOT that kind of child.
The attacker was the school principal. He was always an idiot, still is, will be until he dies. I think what hurt the most was that my mother did not care. It was just more of what she let our father do, so she felt we should be immune to it. I still am not immune to false accusations and intimidation.
If I had had a mother like you, I would have been so grateful and proud.
You may have embarrassed yourself by your vocabulary, but as the years go by, you will be held in higher esteem by your daughter for your mother hen tendencies.
DO NOT APOLOGISE! I bet her husband, kids, and half her 'friends' wish they had the backbone to do half of that.