Oh, hell no. Dean knows what it means when FDR gets out of the car all quiet as crap like that. It's classic Pissed Girlfriend, right? And Dean has experienced that enough times to know he's got two options: Either defuse now, or wait for the nuclear explosion later ( letting it die out is apparently not an option).

"Son of a bitch," he mutters under his breath and jumps out of the car to follow FDR into the house, without bothering to say anything to the other two. There's no time when there's bombs to defuse.