This reflects just as badly on the org's leadership, as it does on the individual. Managers and other leaders need to give people a talking to, when they engage

This reflects just as badly on the org's leadership, as it does on the individual. Managers and other leaders need to give people a talking to, when they engage in toxic behavior. And they need to set a good example by promoting people who are good teammates. Do this consistently, and people will change their behavior for the better.