I have had more respect from the majority of clients I actually see, than men I've dated, but I think it has to do with a different expectations. I only want a client to be clean, friendly and follow my protocol. I don't have to find him attractive, get sexual satisfaction or share common goals or interests.
If I am dating, I am trying to find someone I fancy, whose company I like. That's a bigger ask than just 'clean and polite' and so in the past I've put up with disrespectfu boyfriends that I never would with clients because strong attraction (particularly for someone who has had a lot of sexual partners!) is quite hard to come by. The minute a client pisses me off with some disrespectful shit, even if he is a regular, I am happy to bin without a second thought, because I have no emotions or desire invested. But when I fancy someone, or more so, love someone, its not so easy to be so 'ruthless'.
I think punters and boyfriends know this, the former know to play nice if they want to book the woman they want again, and the latter know they often have more room to piss about. IME they use that to their advantage. This is why I don't bother with finding love anymore, because the minute you show a guy you like him, watch him play you like a football.