This is of course entirely by design -- liberal opponents of sex work have to rely on automatically, by definition denying agency to any sex worker who disagrees ("she is brainwashed/has internalized oppression/..., therefore her arguments cannot be considered, let us see what this ex-worker has to say") -- otherwise the illusion of compassion that they work so hard on creating would instantly evaporate.

It is really quite infuriating -- to me personally much more so than the conservative opponents position, which while equally repugnant in terms of actions implied, at least leaves some scope for respectfully disagreeing: it does not bother me to be called sinful, or evil, or immoral by someone else's moral code (surely all of us are quite immoral by /someone's/ moral code), but I would consider it deeply offensive to have my opinion about my own life dismissed out of hand.