He doesn't need to "take him on". He needs to gather information to decide whether or not he needs to leave. If one jumps to conclusions and passive aggressiv

He doesn't need to "take him on". He needs to gather information to decide whether or not he needs to leave. If one jumps to conclusions and passive aggressively resigns every time one encounters dysfunction in an organization then one will never be able to work on a team larger than 3 or 4 people.