Word Reference has some guidelines regarding swear words or offensive terms/expressions - they are allowed, but users must use a specific emoticon before the word so that other users know if the word/expression should be used with caution or if it should be avoided at all.
I suggest that we do something similar, i.e. to put in evidence such words or expressions. We could format the word (e.g. by setting the colour to red) or use an emoticon, but I don't know if that is possible in this site.
Edit: The guidelines for the italian WordReference forum are here (see rule #9):
And here you can find an example of the usage of the emoticons:
What do you think about this?