“Baking chocolate” or “baking cocoa” is very bitter.

Kiddo probably mistook the baking chocolate for a regular candy bar and was unpleasantly surprised at his discovery of the distinction.

At least that’s my best guess. There’s too many products on the table to be sure.

Kid is being stung on the nose.

It looks like there's insects, bees maybe? This kid could be like

Hershey’s chocolate pre-dates powdered milk, so the milk chocolate had a sour taste due to being made with not fresh milk. Today Hershey purposefully incorporate this flavor profile into their milk chocolate because it’s their signature milk chocolate flavor.

m&m’s are a Mars product, but they were originally a collaboration between the two companies using Hershey’s milk chocolate. Today Mars purposefully incorporates this flavor profile into their m&m’s chocolate blend to maintain this signature flavor, but in America only. m&m’s made in France do not use this sour flavoring.

His dad died of syphilis, leaving him orphaned because his mother died in childbirth. The chocolate bar reminds him of when his dad would get paid on Thursdays and bring him home a Hershey’s bar. For him, eating one tastes so sweet but leaves him feeling so bitter. Especially when it’s gone, just like his dead parents. But what’s fucking sweet is he can replace the chocolate bar once every Thursday when he himself now gets that paycheck for working the factory, just like dad.

He's crying in solidarity with the worker children on the cocoa plantation. Though the fruit of colonial enslavement rings a bitter aftertaste, the sweat of their toil accords a delicious chocolate bar with which to console himself.