I'll state in an answer what I suggested in a comment; if you see expletives, simply edit them out. They do not belong in any answer, and the same point can invariably be made without the cursing. If, after editing, the answer is still offensive, then it's time for the flag.
In this case, as Pete points out in his answerhis answer, even after removing expletives the answer is still advocates that it is appropriate for a teacher to hate a student. That's pretty offensive, bring out the flags and it will be dealt with.