Gortner's character is smarter and tougher than anyone else in the diner. In an experiment in depravity, he decides to see how far he can humiliate and bully people before they stand up to him--if they do at all. He uses his worldliness and intelligence to insult them in ways that they might not detect, or pretend not to notice. When he learns that a young man bears the nickname Red Ryder, he sets out to show the banality and hypocrisy of American culture.
It's an anti-Western: the antagonist, a Vietnam veteran, finds that America is not the home of the brave, that perhaps the free and heroic spirit embodied in the popular conception of the Old West has vanished--or has it?
While the character is reminiscent of *Blue Velvet*'s Frank Booth (played by Dennis Hopper), *Red Ryder* is the superior film. Its predator is more comprehensive, realistic, and transparent. Booth, like many of Lynch's characters, is ultimately a cipher, and therefore uninteresting.