the shallowest monster

Right now the boys are really into books about monsters. This past week, we went to the library and got out seven books with a monster theme. Nothing scary of course. Just fun stuff. And most of them have been enjoyable. I do have to complain about one of them though and it has nothing to do with the monster theme.
This particular book is all about the different choices that a monster can make and how each choice can lead to a different ending. For example, the monster could eat you or it could become your friend. If it eats you, the story is over. If it becomes your friend, you can take it to school where it faces the next choice of fitting in or eating the principal.
Halfway through the story, the monster meets a girl and either scares her away or gives her a rose. If he gives her the rose they fall in love and kiss. When they kiss either he turns into a handsome young man and the story ends or she turns into a monster. And here is the part that rubs me the wrong way. When the girl turns into a monster, the two possibilities are that the monster will say that they are both monsters and should just get married or that he will say, "Uuuuuuurgh!!! You look horrible now!"
So one page before that, the monster gives her a rose and they fall in love. And now, she looks just like him and suddenly he is saying that she is too unattractive to be with. What?! I find myself wanting to yell at this fictional monster. I want to ask him what his deal his. Is he really that shallow? And yes, I get that it is just a kids' book and I'm getting all worked up for no reason but I can't help being angry about the message it sends. Of course, my boys have no idea that it is implying that looks are more important than anything else. They just see a book about monsters and think it's wonderful. I hope they stay ignorant of those types of things for a long time yet but this book doesn't help.