To me it’s a fake argument. High schoolers in France don’t have jobs for the most part and fully rely on their parents. This is probably in Paris so it would be the case, and with those names it is likely the case, also saying something about their parents class

As a cultural side note, French people don’t really make sandwiches at home to eat at school or work. They would for a picnic, train trip, and when they have little time to eat or they know they’ll have no cutlery available