Employees / Contractors / Customers / Suppliers are NOT your friends.
I'm not saying you need to become the "boss from hell", but you should always maintain that arms-length relationship.
It is inevitable that one day they will let you down or they will withhold information from you or any other number of things. If you did not maintain the arms-length relationship with them, then you will take it personally and it will be painful.
There is truth in the old saying, don't mix work & pleasure.
I'm not saying you need to become the "boss from hell", but you should always maintain that arms-length relationship.
It is inevitable that one day they will let you down or they will withhold information from you or any other number of things. If you did not maintain the arms-length relationship with them, then you will take it personally and it will be painful.
There is truth in the old saying, don't mix work & pleasure.