Rarely.  The stress is just not worth it.  As I have become older, I have become adept at stating my opinion without coming across scathing.  However, I am known as the agressive one at work.  Some people simply cannot take it.  I say grow a pair.  I will never state something that is not completely obvious to me and others, and if you are offended, we can talk, but I will not take a part in a pity party.  
Man up, see it for what it is worth, correct it or not, but don't get offended again if I am not so delicate about it the second time.