Go to the gallery appointment.
You already feel your work is not quite ready yet for a show, so fine. Use the appt as a free way of getting some professional input so you know the kinds of things you might need to work on to get better. Use it also as a way of getting more experience in handling yourself in these 'art situations'.
It's a learning experience, and will help you. It's bound to be a way more pleasant and encouraging experience than the dinner you described!

I'm glad your husband apologized. I guess everyone has their bad days, right?

Go, and good luck!