When was the last time an 'escort' escorted any of us anywhere. Kings and queens have escorts, or maybe some Hollywood star with someone suitably posh on her arm to keep the flies off.
No-one is going to introduce a prossie even to their grandmother, much less proudly walk about 'escorted' by a prostitute. The term 'escort' is a cultural idiocy, a sarcasm.
There is nothing, on the other hand, insulting about the word "prossie" any more than "brickie" or "roadie". "Pro$$ie" simply means that the tart in question is being referred to in her money-grubbing capacity, rather like writing 'Micro$oft'.
Prossie is quite a nice word, and describes her work capacity accurately and even affectionately. 'Fluffie' on the other hand does have slightly fantasist connotations but can be balanced by the fact that he is paying for a fantasy and likes to make it last even when he exits the church of his prostitute's cunt. Not quite as bad as 'toadie' I suppose, which is a equivalent to "white knight covered in fannyshit, prossie-shit, horse-shit and bull-shit, every other blinding worshipful shit, to the extent that "white" like "escort" is completely make-believe crap.