That must have made his feedback seem pretty silly. It's hard to respect someone with a marker stuck to their forehead. Your sketch was likely the more professional thing in the room.
Used to believe you had to respect the feedback just because it came from the boss. Hearing about the marker stuck to his forehead totally flipped that for me. It makes @amy_cooper31's point hit way harder about who was really being unprofessional there. Now I see a situation like that and just think, yeah, the sketch was definitely the serious part of that room.