I think a lot of the pro-sex work stuff - the stuff that isn't just an edgy stance, which is something else entirely - from feminists comes from the understandable realisation that sex work will exist and that if it does exist, it should exist safely. Making sex work illegal will not lead to an end to sex work but only make it more dangerous and further, may deny some women of their only source of income. So far, sensible. The English Collective of Prostitutes realised this and had the slogan 'For Prostitutes, Against Prostitution', which is great because it also points to a world without, y'know, work. We can work towards better conditions for sex workers whilst also saying sex work is shit, because if sex work isn't shit then what's the point campaigning for better conditions?
It seems to me that the desire the present sex work in a positive, liberating light comes from a reaction against those who wish to make it illegal - which seems understandable, if misguided to me - but also a belief that not doing so necessarily implies that women involved in sex work are victims, forced into sex work with no choice. So choice, liberation, autonomy, etc. must be emphasised. This, to me, seems highly questionable in many respects. Taken to its logical conclusion the same sort of argument could be drawn out to argue that criticism of any sort of work in capitalist society necessarily infantilises those who work, reduces their autonomy, etc. Drawn out, defence of sex work as work can become a defence of wage labour in general very easily, imo.
Like a lot of the intersectionalist / twitter left stuff, and again, assuming the best intentions on the part of those who hold these beliefs, for a moment, there's a sensible starting point, or at least an understandable one. But these starting points are drawn to weird conclusions and, actually, weird conclusions that wouldn't be too strange, shorn of all the edgy rhetoric, coming from the right.