I would send him in weenie.
Used to get the same argument from our son and, to me, letting him stay off school just because he considered it a waste of time wasn't a lesson I wanted him to learn.
I always made the last day of term a reason to celebrate with a special evening meal and he would get to choose what we would eat. It must have been a credit to my culinary skills that he invariably chose Shepherd's Pie with red cabbage. Well either a credit or maybe he decided that was one choice I wouldn't burn.