Robert Kagan wants to know if Twitter was

 always as rude as it is today.  The Twitter Rule 

has always been:  Be polite to peacemakers

 and rude to warmongers.

Stop laughing at the way Donald Kagan looks!
You'd look the same way if you were a
neoconservative and your children were
named Frederick, Robert, and Kimberly.

World's Worst Yobs #104
Robert Kagan