Earlier quoted context omitted.
Cycle couriers/deliveroos are the cycle equivalent of the white van man and the black cabbie - they drive for a living and time is money, so they try to kill you if you so much stand in their way. Luckily even if they crash into you, they are as likely to kill themselves a you - something that cannot be said of white van men...
Ok, but it's really lycra clad commuters I've had bad experiences with... some of them are just oblivious I don't find black cabs threatening. It's the Ubers who are usually really dangerous. Not sure if it's because they're new to their jobs (a high turnover occupation?), or half asleep.
Or perhaps it's because they're often faster than you, come out of nowhere with no audible warning, cut you off based on their expectation of your predictability, and then shake their asses at you.