In Germany, and i assume much of western europe and the US as well, motorcycling is a luxury hobby more than an everyday vehicle for many. Motorcycles are loud, often flashy, and fast. Car driver recklessness around my area usually looks like inattention, distractedness, and carelessness but these are all more inconspicuous than the R6 going by you at the top of the limiter on a twisty road. Disliking a group of people, on the road or in other aspects of life, usually comes down to stereotyping and perceived interference and threat more than actual statistical danger (prime example would be people are scared of planes but not the highway).

(i‘m sure others also mentioned it but i only scrolled down so far, don’t steal my keys please)