Medieval ethnic stereotypes

In describing the great variety of Europeans who left to go to Jerusalem during the First Crusade, an English writer, William of Malmesbury, wrote:

Then the Welshman abandoned his forests and neglected his hunting; the Scotchman deserted the fleas with which he is so familiar; the Dane ceased to swallow his intoxicating draughts; and the Norwegian turned is back upon his raw fish.

Garrison Keillor would understand.