Bad enough. Grew up with all three around our home and farms. Had several encounter with mocs and coppers. I was always told the babies are just as poisonous. We always had a hoe handy. Off with their heads! And, yes, they can still bite after that. Daddy had a gun handy for the rattlers.
A late friend of mine was the head Ranger for the Cuyahoga Valley Reservation. I told him the were Copperheads in Ohio. He said, “No way!” I took him to an old well pit and lifted the lid. There were 5 big ones down there. He was very surprised!