I don't agree with the person you're talking to, but in the US, "just quitting" often isn't an approachable option.

People who think one can causally quit is more often than not luxuriating in privilege, be it family support or your own funds.

For millions of Americans, the choice is between a job that makes them want to die, or taking the next step and quitting to die in the gutter, because land of the greedy, home of the unshackled sociopaths.