as they knew how to behave in a restaurant, no matter how posh or how long the food takes to come.
Rose tinted specs, much? You got lucky, that's all.
I thought I recalled my DC being well behaved, and then remembered the one or two times they weren't.
But it's not just about behaviour, it's about all the other bits, too. The cutting food, trips to the bathroom, etc, etc, that would make it less of a treat for OP, when for once the day was meant to be about her.
OP's DH didn't give much thought at all about this "treat", and the fact that he's still sulking makes me think it's not about whether the OP actually wants to go, but about him wanting to preen his feathers about "look what a nice thing I did?".
A decent bloke would have accepted the OP's politely expressed opinion and arranged something more to her liking.