Q: Radio starts when SUV does

So strange a problem in my SUV - the radio comes on when I start it. I asked the dealership and they said it’s manufactured that way. I really don’t like the distraction when I’m starting my SUV and the radio blares out - it’s startling! I had been taught that to save energy, it’s best to have the a/c, wipers, radio, etc. turned off when starting a vehicle. Is there any way to prevent my radio from starting with the car? I often forget to turn it down when I leave the car, so it really makes me jump sometimes.