bicycles on the sidewalk?

funny how people get so enraged by bicycles...
as I ride my bicycle on the road I am honked at... I am screamed at...
so often the car driver gives me a facial expression silently voicing their displeasure with my being on a bicycle on the road
while these same people pass double parked cars or cars parked in other illegal ways blocking traffic or inhibiting flow
yet the car driver does no honking, screaming, gesturing with hand or face at the car driver or car

why?