I have to agree that the way you treat people has little to do with others. Some exceptions do apply.
This business of being shitty to someone because you're not attracted to them and you want to put them off is just passive aggressive. Especially when you signed up to take a chance. No one put a gun to your head.
However I am trying to think how I would handle a situation where there was no attraction.
I'm much more of a personality person as far as what attracts me. So I would give it a few days. But it is awkward when the other person is attracted or at least wants to have sex and you can tell that you don't.
I think off camera I would tell them that we are in the friend zone. I would ask them if they wanted to continue for the sake of the experiment and perhaps the perks of the show or not, but also emphasize that time would not change anything.
Would I allow doctor cal or the sexpert get involved? Oh hell no. The way they handled Matt and Amber was a disgrace. They saw that he was a complete POS and that she was shamelessly desperate yet they encouraged them (Amber nost cruelly) to continue this humiliation for Show ratings. But I digress...
if my partner was totally cool with it then we could play along but that is rarely the case. If my spouse continued to pressure me I would bow out rather than decide to act like an ass to run them off.
If the opposite were true and I could see there was no attraction to me... I honestly don't think I would ask.( like I assume Mindy did). If there was no attempt at romance, that would tell the story and I wouldn't assume he's just shy around women or some such excuse in my head. I would bow out. Hard to accept but harder to stick around for it.
And if my spouse tried to pull the same stunt like wax melt girl or like Zach is doing, being rude, disdainful, and antagonistic I would bow out but hopefully not before my East Coast sarcasm and snark shut him up and illuminated his assholism for the world to see.
(But Neil did get the last word which was soooooo delicious!!)