12 year old 'wisdom'/ Workblogging....

Yesterday BB picked my girls up from school. After bringing them up here to 'beg' for soda from the machine (lol), she took them to a local play park. At this park is a large teeter-totter. My sisters eldest daughter was on one end & my eldest on the other. BB was standing somewhat behind her, unbeknownst to my daughter. Every time the teeter-totter would come down, hitting the ground , my daughter uttered quietly "My ass." Catching BB's interest, she stepped closer. "My ass." Plop "My Ass."Plop. "My ass." "Hmmmmmmmmmmm", BB thought. She came up closer to her & at just that moment, the totter hit the ground pretty hard "My f*cking ass." BB's eyebrows shot up at that utterance & she said "What did you say?"
So my 'witty' potty-mouthed child repeated it loud & clear.Sigh............. So much for humility.
Then she adds" I don't seewhy people make such a big deal out of cussing. They're just words. Words like any other words. Words aren't that big of a deal."
So I have to ponder. Are they just words?
We have heard the old rhyme "Sticks & stones may break my bones, but words will never hurt me" I have likely said that rhyme more than a thousand times. So why DO we make a big deal out of cussing.
Now I'm not condoning the usage of the swear words by a 12 year old child, but I do have to think on her opinion. Thoughts anyone?