I am a daily bike commuter in Berlin. I think dickish people are evenly spread on all transportation modes. Difference is, dickish car drivers kill people, dickish biciclists don't. There has been 9 deaths of biciclists in Berlin in 2017[1] so there is definetely a reason for higher identifiability for car drivers.
[1] http://adfc-berlin.de/radverkehr/sicherheit/aktionen/62-geis...