I believe so. As if a child who doesn't sit up to a table for meals at home - due to no table (seen property listings with no table) or parents being lazy and letting them eat in front of telly or in their rooms. Or don't have a proper structure of mealtimes, so eat a bit, run about, eat etc.
For these children, going out for a meal sitting up to a table is an alien concept to them.
The only times I didn't sit up to a table as a kid for meals was breakfast during the week as usually parents and myself had staggered breakfasts due to school and their work/other commitments. Or when I was ill. That was usually food eaten with hands - sandwiches, cheese n biscuits.
Think parents should only take kids out if they can sit at a table and only leave in these situations 1. Visiting the loo and 2. If there is a buffet - either a full one or for a part, such as Harvester with salad bar or places with unlimited soft drinks where the diners themselves fill up the drinks (Nando's)