Most Helpful Guy
Sounds like he's an exe for a reason and he deserves to retain that title.
Most Helpful Girl
If you can elaborate on something better than him, then he's feeling insecure that he doesn't have the upper hand. He'll feel like you're always downsizing him and making him realise he's ignorant.
If you can't downplay your intelligence around him, you need someone who's smart and has a opinions on various things. Someone with whom you can have a healthy exchange of ideas with. So ideally, he won't be your type.
But if you want to be in his good books, you'll have to stop yourself short. He probably thinks you're snooty, when you're probably not. It's just his impression because he can't deal with you head on. He may have started dating you cos you're smart, but if that smartness is coming back to bite him every corner, he asked for more than he can deal with. So yeah, avoidance is better.