People who get stung out of nowhere have been swatting the wasp away, or are leaping around trying to avoid them. It's no wonder really. Mind you, most people give the same reaction to bees which are positively docile. People generally seem to find you insane if you don't participate in this swatting and running away business. :)
Now if you were drinking your beer right by where a wasp nest happened to be, yeah then there'd be aggression.
> Now if you were drinking your beer right by where a wasp nest happened to be, yeah then there'd be aggression.
That reminded me of my last camping trip this summer. Right as we set up near a fountain and started eating, wasps started to gather around our food (apparently they love blue cheese scent) to the point we had to relocate to be able to eat (they were pretty insistent).
We ended up relocating with the sun falling so we missed a wasp nest in a rock about 3 metres away from our tent!
We noticed it a couple days later since we stopped caring after not being disturbed by any more wasps.
They got out of their nest at high vertical velocity, and it faced away from our tent, so we just weren't in their flight path. A few came to visit, but they stopped gathering around our blue cheese and mostly went hunting near tree roots.
Now if you were drinking your beer right by where a wasp nest happened to be, yeah then there'd be aggression.