The "you can always go work somewhere else" argument will never stop being a cop out. Your employer controls access to your salary, healthcare benefits, and potentially more. Leaving your job is never a completely safe move and there's an abundance of reasons why it's simply not an option to most people, and it doesn't matter what tier of middle class occupation you have for that to be true.

Moreso this argument isn't one to be taken seriously because it assumes every collective failure is a failure of millions of individual choices rather than any of the cultural inertia or environmental influences that steer our choices.