Are you expecting a news article? This is a story a mom at the dog park told me last week. How you feel about it is entirely your own choice and makes 0 difference to me, but asking for a source on what a teacher said in a 7yo's classroom is pretty funny I think. It's like asking for a source of your coworker making an inappropriate joke or a dog peeing on your lawn - do you operate under the framework that only things with internet sources actually happened?

If someone at the dog park told you a story, is your response to ask for a source and dismiss her when she tells you that one very obviously doesn't exist? Seems like a funny way to interact with people.