For most musicians, the craft of performing music is a really personal thing. It's a part of who we are. It can be hard, then, when you meet someone who's a lot better than you at your instrument. It's tempting to think that having lesser ability makes you a less worthy person.
When you find yourself around someone who's more talented than you, you can react one of two ways: jealousy or inquiry.
It's not helpful to you in any way to act negatively toward this person just because they're more skilled than you at this point. Nor does it take away any of their skill. Even if this person isn't pleasant to deal with, it still won't help you to be unpleasant back at them. Granted, this is easier said than done, especially in a tense audition situation or when you're stuck sitting next to this person every day in ensemble rehearsal.
But you can be better than that. Instead, open your mind to the idea that you could learn something from this person. Ask them who they study with, what etude books they use when they practice, and what kind of warmups they use. They might share with you, or they might not, but it never hurts to ask.
Try kindness and openmindedness the next time you feel jealous of your peers. A little humility goes a long way.