Interesting. I was wondering why they are aggressive. We got hornets in our garden (in Europe), too, and I experience them as very gentle albeit curious beings that like to explore and are sometimes almost playful (sitting on finger/hand, taking off, sitting again...).
According to Wikipedia the #baldfacedhornet seems to be rather a sort of wasp which makes the aggression part a bit more plausible to me. https://en.m.wikipedia.org/wiki/Dolichovespula_maculata
@byteborg @MeanwhileinCanada If you bother them a group will chase you and they can string over and! It was cool to see a solitary one up close completely non-threatened by me. They are similar to Yellowjacket wasps which are a bit smaller and slightly less aggressive and live in nests they build underground.