As a cyclist that drives, this was an interesting, although unsurprising read.
The expectation drivers place on other drivers is that they must be going as fast as physically possible at all times regardless of road rules. This creates an environment where motorists are literally breaking the law constantly. Other drivers will literally harass or even put your life in jeopardy if you drive the speed limit. Going 10-20kph over the limit is expected. Rolling through stop signs is expected. Cutting off buses is expected. Drivers do not tolerate anything that will even remotely slow them down for the tiniest fraction of a moment.
and yet if a cyclist rolls through a stop sign at an empty intersection then drivers will deeply criticise them to a level they never would if that same person was behind a wheel instead of handlebars. Other drivers are certainly disrespectful to each other but the hatred drivers have for cyclists is, quite frankly, goddamn disturbing and terrifying. Drivers will regularly drive in ways endanger the lives of cyclists even if the cyclist is following the rules to the letter. There are so many helmet-cam videos of drivers intentionally intimidating cyclists or even taking faux swipes at them - and these are just the ones that were recorded. It happens constantly.
Perhaps unsurprisingly, the cyclist-drivers were significantly faster at detecting the appearance of fellow cyclists.
Cyclists that drive tend to have a unspoken understanding and respect for each other because we know the bullshit that we have to put up with. We also have a better understanding of the roads from the additional perspective and know what areas are dangerous, where to watch for cyclists, what laws cyclists need to follow, etc. I cycled for years before I got behind a wheel. This meant I already knew the laws and layout of my local roads before I even began.