Honestly, I think Harry and Ron were kind of jerks to Parvati and Padma during the Yule Ball. Okay, I get it that they didn't have any other choice and they just needed dates, but they Instead of just sulking and being jealous over other people who have their own dates and are having a perfectly good time, Ron and Harry could have tried to make the best of their night with Padma and Parvati, since they weren't going to get with Ginny and Hermione at the time anyway. Also, they may not have been having a good night, but that doesn't justify them completely ruining it for Parvati and Padma, too.