Is it rude to delete a friend's comment on your Facebook wall if it contains profanity?

[Sviþjóð]

A friend of mine was deeply hurt and very offended that I would go and delete their comment and do so without telling them. The comment had a bit of profanity in it and included something of an inside joke that could have offended one group of people if they hadn't seen the particular movie my friend was referring to. Meanwhile, I have several friends in such group, and a few of my friends' children as Facebook friends. As this was a part of the Facebook profile that can't believe edited to allow only specific viewers, I simply deleted the comment. Is there some web etiquette I should know about, or is my friend super-sensitive?