what is ironic about Willy's constant complaints about the failure of the consumer goods, given his job in Death of A Salesman?

The irony in Willy's complaint about the failure of the consumer is that he fell for the pitch made to him by advertisement, being that he himself is a salesman and is aware of the reality of pitch.

Explanation:

"Death Of A Salesman" is a two-act play written by Arthur Miller. The play is about the life and death of Willy Loman, a sixty-three-year old salesman.

The play portrays the illusion of American Dream that promises to bring prosperity and success. But for some this promises proved to be vague.

The irony found in constant complaint of Willy about the consumer goods - fridge and car - is that he being a salesman himself bought the pitch of the advertisements. He, himself being a salesman knows how this pitch works. He perceived that the advertisments were telling the truths but he lashes out when the reality of this advertisment hits him.