Oh come on. Everybody complains. All the time. Depending on who and where you are, you'll complain about hunger or about that annoying co-worker down the hall, but you'll complain.

This is all right. I'd say that taking what you have for granted and complaining about what you don't is human nature. But it does not mean that people despise their lives. It means they like to complain.

Asking people, as a stranger, about "their careers" gives them a cue to complain. This makes the results even worse.