The twirling the finger while pointed in the air and whistling means something different to me than to you. It means, "so life goes on" or "no big deal." A similar gesture with the same meaning is saying "whoop de do" while circling the finger or not.
Circling the hand in traffic usually stands for "get moving."
I wonder if you've gotten the "signs" confused. I would work on not allowing myself to think first of the possible negative connotation. It sounds like you expect your husband to be negative and so perhaps more is going on than what you wrote to us her.
If he's critical much of the time I suggest you both read about "non-violent communication." It will help both of you be more aware of how you say things so that they're more helpful than hurtful.
I looked up J.L.'s web sites and none of them describe the gesture that you describe.