Good catch. I couldn't see him behind the pickup when I approached because of the semi. Looks like he could have been flipping off the pickup as it was turning.

That guy in the van was gesturing as you were approaching the stop sign. Maybe he's just angry at the world? Or maybe the pickup in front of him? Hard to tell...

The first guy in the maroon van ignores the stop sign and follows the guy in front of him, proceeding to flip me off along the way. The second person seemed confused about how a 4 way stop works.

They replaced one further up that road not too long ago. You still get idiots who fly into the roundabout without yielding.

They should just replace that intersection with a roundabout.

[USA] Multiple Idiots Running a Stop Sign