If it was just “ow I spilled some coffee” I’d totally agree but it was serious burns requiring hospitalization. It looked like an industrial accident not something one should get from spilling food.
If a steak house brings you a super hot plate they warn you profusely. McDonald’s didn’t do that here. I for one would never expect coffee handed through a drive through window to be so hot I am at risk of second and third degree burns. That’s crazy.