I think the concept of "slavery" within a corporate environment is about perspective. If you work in a job you love, is fulfilling etc etc then your perspective is going to be vastly different from perhaps someone who is becoming aware of the brainwashing surrounding employment. Or perhaps
(s)he just hates their job.
I think there is such a backlash to people who genuinely enjoy their job on this forum, as many people are becoming or are already fully aware of the efforts employers and society go to to "enslave" their employees, including encouraging debt through greed, the pension carrot, the promotion carrot, "prestige", the list goes on. This is transferred to the persons family who starts to have an expectation that person will remain employed to provide for the family. Therefore the person who is employed and is gaining clarity of the situation feels like a slave.
Therefore those who love their jobs, don't take it too personally regarding the ranting about slavery. It just really hurts when you realise what employment is to many people and it gets even worse after you quit and you finally see the "truth" of employment for what it is!