It's not insulting, questions about why I designed things certain ways are welcome.
I decided it was too one-sided to be an opposed stat - unlike, say, Popular/Loner, I couldn't find a clear benefit to being Repulsive. I also thought it didn't fit as well with the others, which are all personality-related. The added opposed stat Trusting/Wary, on the other hand, is going to serve an important role in whether you're playing a social, relaxed monster, or a defensive, edgy monster who might notice more details.
I originally put Attractive/Repulsive with the main stats to reflect the importance and pressure of that perception in high school. Though it's now a minor skill ("Appearance") other characters will still gossip about how you look.