Mostly it's one guy saying "all you 328i drivers keep throwing hate at the 335i", and the rest of us saying "wut?"
Except for power, they're very close.
The main shite-disturber has left the building.
As for the dirty look, maybe the other driver thought you were razzing him when you gave him the thumbs up?
Who knows.
I find it difficult sometimes to relate to the humans.