Beleriphon
Totally Awesome Pirate Brain
And yet, if he were your typical, traditional feudal samurai, the act would likely be considered honorable. The peasant tavern worker dared draw a weapon on him. Being cut down where he knelt would be a fitting punishment. Again: background, culture, setting, mores, region. These are all factors.
In Rokugan it would be dishonourable to not kill the peasant that just drew steel on a samurai.