What about the teacher that steals everyone's ideas and claims them as her own? Or the one who "kisses up" to administrators? These type of non-team players erode down trust and contribute to a hostile work environment. Especially when their behavior is left unchecked.
Teachers need to support and encourage each other. We can't be all things for everyone all the time, but we can offer a listening ear, a kind smile, or a word of encouragement. Petty disagreements or jealousy are juvenile and detrimental to the work place. Who cares who has the best bulletin board or door design? Who will remember in 10 years which teacher received the most applause at an assembly? No one. The main thing to remember is that teachers all have the same goal (or they should) and they should all help each other reach it. Teaching should be a team effort.
(For more of Kim Frencken's writing, check out the Chocolate for the Teacher blog.)