In Act 2 of Death Of a Salesman Willy Loman is offered a job by his neighbor, Charley. Charley and his son Bernard are the antithesis of Willy and Biff. Willy, always proud, pushy and with delusions of grandeur, expected only the utmost from Biff, and always put down his neighbor and his child in favor of Biff being a big, football player and he a salesman.
However, it turns out that it was Willy who came down in his luck, Biff ended up being a loser, and it was Charley's support of his son (not him being pushy) that turned their relationship successful. Bernard ended up being a lawyer, and Charley a successful man who was even able to offer a job for Willy.
Willy rejected because of his own ego. His situation was bad enough for him to even borrow money from Charley instead of working for him. It would have been an even deeper humiliation and blow to his self esteem.