Curse Words... In Kindergarten?

I braced myself. Sweat began forming on my forehead. It is ridiculous what kids learn at such an early age. I can understand why parents want to home school their kids.
"Go on and tell mommy what you told me," daddy said to Myles.
Myles looked down in shame.
"Myles told me that he learned some curse words at school," daddy told me.
OMG! I thought.
"Go on and tell her Myles," daddy urged. "We won't spank you."
I took a deep breath in.
Then he tells me all four "curse" words.
"Zip-It!" he says making the motion with his hands and mouth.
The other three were: shut-it, shut-up and finally stupid.
I finally exhaled.
Daddy and I looked at each other, trying not to laugh.
"Maurissa knows the words too," Myles said.
This prompted an argument between the two of them.
"Okay, okay- just wait a minute!" I interrupted.
"You two know that we do not use "bad" words, no matter where we are," I warned them.
They were silent.