You must endure prejudice from ill-behaved client employees who think "ratting out their guard" is the right way to do things. If a guard doesn't do things the way a Mgr (who never worked in security) thinks is proper they get nagged and coerced into doing things when it violates common sense and proper procedure. Ex. client's un-badged employees have door access anyway.
Often security gets blamed for workplace conditions the client deliberately ignores; door faults, obstructions like mirror glass, and employee thieves in the parking lot. Client employees are frequently rude and ignore security. Guard management could care less about real security they just want a body there so the client pays.