Unlike gangsters or cops or business dudes or hot dog vendors, prostitutes, as a class, are despised, marginalized and abused in real life, all the time.
This means that GTA 5 takes its pleasure in humiliating and abusing victims of humiliation and abuse.
The doctrine of "if you don't like it, just don't buy it" is a useful defense for cynical purveyors of shoddy products.
They would prefer that you move along and keep your opinions to yourself.
But this is really about a corporation profiting from the depiction of some of the most brutalized members of our society, being further brutalized, for fun.
It's about a game that displays incredibly bad taste, that has made ignorant choices, and that is happy to trade on the misery of the victims who it portrays so mercilessly.