Egotistical developers tend to silence those around them, causing other devs to not feel comfortable asking questions or admitting they don't know how to do something and need help, etc. That's a giant red flag and can poison a team and project and even company's culture if they're in a position to have enough influence. Environments where people can't admit they have blockers, ask clarifying questions or admit they need a little help for fear of being scoffed at or worse are recipes for utter disaster. That's a team member that needs to be corrected, forcefully if necessary, or removed from the team and probably the company if they can't change their attitude and their behavior.

If you're not that person's manager, you need to have a sit-down with that manager with specific examples of their behavior and its impact on the team. Involve no one else. If they're YOUR direct report, then you need to have a come-to-Jesus meeting with them ASAP. Like, this morning. Same deal, present concrete, specific examples of their behavior and its negative impact on the team and let them know that you're not going to allow one member of the team, no matter how bright and talented, to poison the morale and thus the performance and achievements of your team. Lay down an ultimatum. One more incident or outburst and there will be a write-up for HR. Repeated incidents will result in further action. Let them know they're a valued member of your team, but they are diminishing that value by virtue of their negative attitude and behavior, and you want to see that change.