Why people think driving a automatic with two foot's bad?

I read many post's saying driving with two foot's (one on brake and one on gas) is bad or weird. Why is that. I drive automatics with two foot's. I was tough this is normal. What is so wrong about driving a automatic with two foot's?

Edit: Im not resting my foot on brake pedal. I stop pressing gas pedal and use my other foot to push brakes. And about why ı use my both foot is ı used to drive manual cars. So using just one feels wrong.