That 5 dislikes is the asshole prince supporters
It could be the supporters of any of the main characters... I'm inclined to think those are the supporters of the green haired guy since he seems to be the favorite one right now. So for them (if it's them), I don't like him because he is NOT a suitable alternative; he may look kind and "loving", but he doesn't treat her like a human been, even if he isn't rude to her (because he's a fucking asshole to other women he interacts with, and you are very aware of it).
*human being (autocorrect doesn't always is on my side)
I agree with you the only one whos decent of them is the red hair guy
The protagonist is a wet noodle, the prince is an asshole, the other green haired guy is shady (by no means a suitable alternative instead of the asshole), the red haired guy seems like a filler... BUT, the fucking prince is the best dressed of all the assholes in these kind of stories.