This was a Critical Mass event, which is why the bicyclists are taking up all of the street as a way to reclaim the streets and protest the lack of safety for riders under usual conditions. It’s not legal, but protests are never useful if they’re fully legal now, are they.
I agree that more bike lanes are needed and also cyclists need to be treated with the respect any life demands.
But flipping off a driver or generally blaming people who drive is fighting the wrong fight. I drive a car, I also cycle, being in a car doesn’t make me anti-bike.
Fight the government - flip off the government - that is refusing to put in safe infrastructure for the bikes (with protests like this, of course. But don’t flip off the driver, at best it does nothing, at worst it widens the gap between both groups and makes it easier to dehumanize and villianize the cyclists).
This isn’t about flipping off a driver. This is flipping off a bad driver who doesn’t understand that what they’re doing is unsafe. They’re flipping off bad behaviour.