I read the other replies first before I responded.
You situation is classic first child, SAHM, your kid tells you one thing,but I bet if you spied on him you would find out another.
My daugther told me that she did not speak to anyone or play with anyone when I first sent her to day camp. I call the camp director and went there when she did not know and saw her playing with kids and laughing and running her little heart out etc. And as soon as she got into the car she was crying and telling me that she was tired (she was) and what a hard day she had - (she had) - how no one would play with her (one girl she desperately wanted to play with did not play with her she was shy) - everybody else did.
And you know what I did?
I gave her kisses,ice cream, a warm bath, let her watch her favorite cartoon (half hour only) and felt happiness when she fell asleep at 7:30pm on the dot for the entire summer.
How is he going to learn to talk to kids if he doesn't stay and talk to kids? How are you going to walk if you don't walk? And a happy childhood is now definded by giving a child everything they want and making everything easy for them. If he does not want to go to camp next year, well find.
Call the director take a look around camp without your son knowing and if everything is find I agree with your husband and let him suck it up.