Who are the high heels and low heels and how do they treat each other ?

Two weeks later Redresal, the Principal Secretary of private Affairs, comes to see Gulliver and tells him about the "two mighty Evils" that Lilliput struggles against: "a violent Faction at home, and the Danger of an Invasion by a most potent Enemy from abroad." He describes two parties of Lilliput, the Tramecksan and Slamecksan, who are distinguished by the high and low heels of their shoes. The emperor has decided to permit only low heels in the administration of Lilliput.