Dear Kettle, you're black signed The Pot

If we get to school early enough my kids have fun playing tiggy/chasey around the play equipment with other Grade 2 children of Climber's acquaintance. Cherub adores it, but he is rather hopeless at it (it's a size and age thing) and only catches other children if the girls take pity on him and say catch me, Cherub-ie!! (they all put an "ie" on the end of his name) and then go off to catch the boys for him. This morning a boy -from our year but one that has never been in *our* class, so I don't know him that well- was pretending to be in danger of being caught by Cherub, effortlessly dodging side to side of some chains. Each time he dodged he said, in a oh-I'm-worried, he's-going-to-catch-me tone; Shit! (dodge) Shit! (dodge) Shit! I was in a rush to leave for Cherub's swimming lesson, making me marginally hassled anyway as I ran up to grab Cherub. So I frowned at the child and said sternly Don't say shit to a 4-year-old please. To his credit the kid looked very abashed and apologised immediately.

Should I now feel bad for saying shit to a 7 year old?

In case you don't know me, I swear a lot but try not to in front of the small people...