Toxic workplace behavior is the biggest driver of negative workplace outcomes, such as burnout and intent to leaves and is a major cost for employers. 

Interesting article of McKinsey Health Institute.

Toxic workplace behaviors are a major cost for employers—they are heavily implicated in burnout, which correlates with intent to leave and ultimately drives attrition. In this survey, employees who report experiencing high levels of toxic behavior at work are eight times more likely to experience burnout symptoms. In all 15 countries and across all dimensions assessed, toxic workplace behavior had the biggest impact predicting burnout symptoms and intent to leave by a large margin.

Read the McKinsey article