Rode a sportive today, the list of rider offences is too long to publish, but can be summarised as a total lack of awareness of anything else on the road, vehicle, bike, animal, people etc.
Communication is almost non existent, coming up the inside on steep hills was a problem on RideLondon at Leith Hill for example, changes of direction without warning causing crashes.
As a generalisation, they buy the pro or top of the range kit and bikes, then ride as if they are on TDF, taking racing lines across slower riders, ignoring any approaching traffic at junctions in case they lose precious time.
Not sure why I entered two sportives this year, did not get great enjoyment out of them.