"They'll also be holding the rose after you give it to them, even if they were all completely stoic. Examples are, hm, we've had this alt of yours in the audience reaction department for a century or so. Nabbed him out of a torture fortress that uses... well, you know how I said the one guy thought everything was a simulation designed to torment him? That but for real, lot of memory erasing and running scenarios over and over with slight variations, lots of rescues that turn out to lead right back into torture - these are the levers I have for helping with this sort of thing, putting him in the audience - anyway.
"His comments, when we can get him to make them, are biting sarcasm over every aspect of everything. This is fine, some of them add an acidic bit of lightness to the dish we're trying to make here, and we can cut everything else: this is less true of a protagonist. If something goes obviously wrong with something we've set up, it's fine to poke fun at that; it would be obviously inauthentic if you didn't. If you catch someone egregiously lying for drama, it's obviously fine to eliminate them. But sketchy though we may be, we are not torture simulators, and I hope that you can cultivate an amount of buy-in to the premise that doesn't involve going, 'wow, a romantic boat ride on the romance show, how original,' every fifteen minutes. And similarly, that you'll be aware that the drama between contestants is very serious and high-stakes to them, and that if you take pot shots at someone you consider to be an obvious bad actor, you're more likely to harm someone who's trying to care about you than you are the villain."