Comment: This "rule" is new to me.  Where did it come from?  Was it the 11th Commandment?  Or the 28th amendment of the US Constitution?  Or perhaps it is the 1st rule of Ms. Fawcett's personal and totally subjective version of "Rules for Radicals"?  Or perhaps Ms. Fawcett's "logic" is similar to that of former SCOTUS Justice Potter Stewart who, when asked how he defined pornography, said "I know it when I see it".  I'm so confused!:)   

But can you blame me?  After all, since the terms "fuck you" and "fuck you assholes" have, within my lifetime, been transformed from perhaps the worst things we could say to each other to now totally defanged and democratized parts of everyday speech, how can it be that vertically extending one's middle finger should be "saved" for life-threatening experiences--as if that was still the case even 50 years ago?  The gesture, and its current meaning, date to at least the Roman Empire.  So it seems we should now know MANY things are more offensive--such as war!