Drivers who think because they're encased in a lump of metal it automatically makes them immune to every rule of the land, but are more than happy to call other road users for minor infringements.
Drivers who believe that paying "road tax" (which doesn't exist) means they have exclusive use of the roads.
Drivers who make up their own laws and call out people who don't follow them, for example "cyclists should wear helmets"
Drivers who ignore people legally following the highway code (cycling two abreast) and believe because they're in a hurry then everyone else should move aside for them.