Quick question about Lacanian subjects

Does Lacan overdo the instability of the subject and the instability of their inhabitation of social roles? I don’t think they are often particularly unstable, and I think they’re more stable in the working class than in other classes. I think this latter point has something to do with postmodernism being a luxury (as my wife would say). Those with less money are typically less able to indulge in fluid subjectivity; they’re too busy surviving.