Though you have a point there and I must say I agree, I personally won't be happy if my boss is too harsh on me. But don't you think when you become too relaxed with them, it might lead to them not taking you seriously?As an employer,you really need to motivate your employee in very situation. Employees are humans,you really need to treat them as one. You shouldn't be too hard on them. Being hard on them isn't what will make them carry out their duties effectively