I don't like entitled assholes. While our FMC is a bit entitled, MC did agree with the conditions, which justifies some entitlement from her part. Some random girl who hasn't even dared to confess, on the other hand, who's also treating MC as lower than her, can go lick a toilet. She deserves a taste of her own attitude.
Also, anyone trying to claim that people who have one opinion or the other about the MC are virgins or losers or whatever are just projecting. Mature people understand that taste in fiction doesn't have to correlate to how successful you are, and don't shit on other people. Say what you want about the characters; they're not real. But don't be so weak you feel you have to attack other people to justify your opinion.