In your link to the guardian piece the only bit about feminists is here:
"Notably, said bashing includes a cohort of feminist critics who, in abhoring the activity, choose to hate the perpetrator. This is evident not only in Julie Burchill's string 'em up stance, but the notion that, as "all prostitution is rape", sex workers cannot know their own minds, or be in control of their bodies, and thus consent. "
If Julie Burchill has a position that all prostitution is rape, then far from hating prostitutes, she sees them as victims.
That article doesn't back up what you are saying at all.
If you want to find people who despise women working in the sex industry, start with men, then drill down to right wing / religious attitudes, and there you will find the vitriol.