You're correct that under formal circumstances it's correct to leave the fallen utensil where it fell on the floor for the waitstaff to pick up. In a restaurant, I would do as you suggest and nudge it under the table so that no one trips on it. Your husband may feel uncomfortable with this rule because he doesn't want to appear careless, lazy or overly demanding of the waitstaff. However, the reason we have this rule is to avoid placing a utensil that has been contaminated by the germs on the floor onto the surface where others are dining. Remind him how much worse he would feel if a dining companion erroneously used a dirty utensil that had been retrieved, not realizing it had been on the floor.

