Hellobee Boards

@mrsjazz: how old is your LO? My answer night depend on the age.

I'd address it with the teacher tomorrow, explaining why your child knows of the KKK. I'd want the teacher and any parents that mention it to the teacher to know why within context my child was talking about the kkk.
My 4yo explained the basics of child birth and nursing to her whole class, one parent was upset that their child now knows the word vagina, but everyone else didn't mind- understanding the context.

Well, it's actually good/developmental appropriate go her to bring it up in play. It's a great processing tool! But, I can see how other parents may be uncomfortable with that. I'd say to let the teacher know and then take the casual stance of "That's okay at home, but we don't play KKK at school." Hopefully she'll feel comfortable still talking about it at home & other families won't give you grief. (This is how I deal with "bad" words with my preschoolers and it seems to work well.)

Could you maybe switch approaches and not tell her not to talk about it but maybe explain why it's not something to joke/play around about? Maybe explain that it could really scare her friends and if they want to pretend bad guys or monsters that's ok but don't bring up them specifically?

I had a situation with my son involving gun play, and I basically told him that doing that would possibly upset some people and he might get reprimanded for it if he did it in a public place. It worked better than telling him not to do/say something, because that just made it more of a thing for him to defy me on. YMMV though.