Fuck You, I'm Genteel!

We have this family friend...I'll call her Tracy.
Tracy is actually a coworker and friend of my mother but she's become like one of the family.
Tracy is one of those people you immediately love or hate. She can talk to anyone about anything. She is completely genuine. What you see is what you get. She doesn't pretend to be anything more or less than what you see and she will tell you the truth everytime.
Some people adjust their personality and behavior depending on the people they are with; not Tracy. Tracy will say the same thing to her best friend or her grandmother. It doesn't matter.
Now, let me tell you about Sister #3. (We'll call her 3 from now on). 3 is the very definition of uptight.
She hates it when I or any of the other sisters use the word "fuck". She (hopefully jokingly) admits that her husband has never seen her naked with the light on.
She has a perpetual stick up her ass and we've known this for years. We accept it (though we talk shit about her behind her back constantly).

Every month, 12 of us get together for a card game.
It's at a different person's house each month and we sit 4 people to a table.
This month, it was at Tracy's house and as per usual, Sister #2, #3, Tracy and I sat at a table.
Our mother sits at the main table with the other elders of the group. She's usually out of earshot so we will sometimes talk about things we wouldn't want our mother to hear.
Sometimes, these are things 3 doesn't want to hear either.
We were discussing American Idol of all things when Tracy mentioned a contestant's clothing and how you could almost see her twat.
Yes, she said "twat".
I was a little shocked to hear this word come out of her mouth. Sister #2 was surprised as well but 3 was appalled!
2 and I were suddenly nervous.
It wasn't that long ago that Tracy said something inappropriate that pissed 3 off and when someone is wound as tight as 3, you're POSITIVE something's going to blow at any given moment.
I tried laughing it off, hoping a little comedy would lighten the situation.
"Tracy! (hahaha) You can't say that word! Some of us don't even know what it means!" (hahaha)

It didn't work. It made matters worse because Tracy had to explain the meaning of "twat".
"You know...pussy....cunt....TWAT!"

I felt lightheaded, like I was suddenly having an out of body experience. 3 was going to fucking explode!
I couldn't watch. 3 looked angry and we certainly don't like her when she's angry.
The angrier 3 got, the more Tracy said it.
"Twat Twat Twat Twat Twat Twat"
Was she doing this on purpose? Surely not. Does she not know she's playing with fire? 3 is unpredictable. 3 is volatile. Pissing 3 off is like playing raquet ball with a hand grenade.
"You have a problem with twat, 3?" she asked.
"You couldn't hang with us then, 3. We say shit like that all the time. Pussy, dick, twat....."
"Where did you come from 3? At work we say stuff like that and your mom doesn't get freaked out!"
Twat twat twat twat twat... this is really going to fuck with my google rating!
I kept hearing it.
It was echoing in my head.

Surprisingly, 3 kept her cool and simply said "I am not comfortable using that kind of language."

The next day, Tracy asked my mom what she did to us to make us like that.
The only thing my mother could say was "I just taught my children what was appropriate and what wasn't. Using that kind of language in mixed company simply isn't appropriate."

Later, Mom said to me, "I guess they all think I raised a bunch of uptight kids."

Are we to be considered "uptight" because we choose not to use that type of language in a diverse group of people?
Most of the people in this card group are my mother's age and older. Some are old enough to be my grandmother!
I wouldn't even want to HEAR the word "twat" in my mother's or grandmother's presence, much less say it.

Isn't that just good manners?