No malice of any kind. And they're to be kind, compassionate, and forgiving toward each other. James stresses controlling your tongue, and being slow to get angry. Throughout the New Testament you'll find instructions which, if followed, will help us get along in the church. A community of Christians isn't always what you would expect of Christians.
Petty behavior is destructive.
Pride and arrogance can destroy community. Christians have unique personalities, and those can cause conflicts which hurt the spirit of community. But there is an ideal to pursue. Paul challenged Christians to live in unity. We need other Christians who will speak God's Word to us.