Do you think it’s absurdly hypocritical to punish your kids for cussing, when you cuss unrestrained around them?

I was at the Dr’s office today, and a couple of moms were sharing “funny” kid stories. One mom’s story went something like this. “Little Johnny came home once and told me he’d learned ‘Trick or treat! And if you don’t give me a treat I’ll give you a bowl of shit!’ Well, I slapped little Johnny in the mouth cause I don’t put up with that shit! Then I found out that he learned it on the bus, and I talked to the bus driver and said, “Look! I don’t give a shit, if he EVER talks that way on the bus, pull over and slap the shit out of him!”
It was all spoken clearly and loudly for everyone, adults and kids to hear. The whole thing disgusted me. WTH his wrong with some people??