A teacher in one of these threads said she teaches children who tell her to fuck off all day long.
If, and when, my daughter comes home using that word I'm going to want to know where she got it from. And if I can manage to find out, some way or other, that children are regularly using that kind of language in her classroom I'm going to want it stopped. I think children who speak like that should be separated from the class. Likewise with children who attack teachers or other children. And I'd visit and write to any number of boards, individuals and committees until those children were removed.
What would other people do?