The common explanation is that Hershey's chocolate contains some amount of butyric acid which tastes/smells like vomit. Adam Ragusea on YT did a pretty solid video on it.
Why Hershey bars taste like vomit (and I love them)
Not all US chocolate tastes like Hershey.
One of the biggest General Motors assembly plants for trucks and SUVs is in Arlington as well. No coincidence I'm sure.