Poor little guy, I would have helped him clean himself up first, put him in my bed and then cleaned it up for him. I think your husband was very harsh.
OT:
I got it beat though, my co-worker told me how she would punish her daughter when she wet the bed. Her daughter often slept with her and in the middle of the night she might have an accident. She would wake her daughter up, make her clean it up and then make her sit in a corner until the sheets were changed. I normally would not say anything about someones parenting style, but I told her she is only humiliating and traumatizing her poor kid and she'll probably continue to have accidents. She took her daughter to a doctor and he told her the same thing as there was nothing medically wrong with her. Her daughter was 7 at the time.