its not about showing ID, i dont think he wants the rent a cop earning 8 an hour to hold onto his ID while he worksCapt, it's not your choice whether you will or will not comply with a company's policy when you enter someone else's property. You can choose to walk away, but a business has a right to know who enters their property. The security officer ("rent-a-cop") is just following orders.
If a city/utility worker wanted access to your property you'd ask to see their ID, would you not?