It is rude to cuss around children.
Tom is at the park with his children hanging around with the parents of some other children.
Tom wants to impress some of the other parents at the park.
Tom tells a funny story about one of his kids getting stuck in the mud.
Tom tells the other parents a vulgar story with lots of swear words.
The other parents laugh and share similar stores, afterwards they invite Tom out to a family BBQ for the next weekend.
The other children overhear and repeat some of the words, the other parents upset with Tom decide to shun him and go talk somewhere else without him.