Ds1 just asked me if fucking is a bad word. To which I responded yes. Dh and I don't swear and the kids aren't really exposed to any adults that do really either (at least not in the presence of kids) so I asked him where he had heard it and he said ds2 age 6 had told him that a boy in his year kept calling him a stupid fucking idiot every day in the playground. I spoke to ds2 who confirmed it and that the boy saying it did it most of last year 2.
What would you do?