I once read a story (about why one should not be rude to strangers or rude in general) in a local magazine that, once Tsar Peter I asked about directions from a Sergeant. Sergeant (not knowing whom he was talking to) rudely answered. Tsar asked that what did he do for living to which Sergeant replied that he's in the army. Tsar asked whether he was a soldier, "Go up", sergeant replied. And after two to or three "going ups", sergeant said yes. Out of curiosity he asked Tsar what did he do for a living. "I'm also in the army." Tsar replied. "Soldier?", "Go up!". And after going up about some 10-15 times and finally above General the sergeant started crying and begged mercy from the Tsar, for he had been rude.
My question is, is this story true? And if it is, can someone please share the source?