Before I go and challenge this in real life I would like MN to give me a modern day reality check.
I am saying the following not to be goady but to give the full picture so not accused of drip feeding later on.
My children go to a very middle class independent primary school. Great set of kids and fantastic teachers. The parents are a very friendly bunch who are all inclusive and chatty, a number of them do not have English as their first language and will chat to each other in their native tongue but if any English parents are around on their own will switch to English to include them in the conversation.
My dh and I do not swear - the strongest it gets in our house is bloody. Now I'm not naive to think that my kids do not know swearwords, and that they won't hear them.
However, the thing that is getting me wound up is a number of the parents are saying "fuck" on the sideline at matches a lot. This is said both in loud general conversations with each other, including when speaking in native tongue so the only English word in their sentence is a swear word, and also when chatting to others in English. A number of both first language English speakers and not will also say it when referring to the children although not directly at the children e.g. "fucking hell what are they playing at". None of them talk quitely, they are all loud speakers.
AIBP (prude) to think that language like that should not be said on the sidelines particularly when the children are under 10? I have always been very conservative with my language so feel free to tell me I just need to get into the 21st Century.