Some okonomiyaki purists insist that it can only be eaten fresh off the grill with a spatula (teko/hera/kote), not with chopsticks. Soccer Dad uses chopsticks and eats them off a plate, triggering Mirako.
(Of course people from Kansai eat them with chopsticks all the time, and with rice to boot, so don't let Tama get anywhere near this artist's Mirako.)
TL;DR: Okonomiyaki is SRS BNS and Daddy committed a faux pas.