Is it time to start calling out bad cyclists?

They're not insane ideas, they're childish experimentation. People think riding a bike is easy. It isn't--'as easy as riding a bike' refers only to checking your constant tendency to fall sideways and correcting it, only to then fall to the other side and correcting it, and so on. Once you have mastered that, you hardly notice it any more except for when you lose control. This is considered a child's skill--adults are often embarrassed not to have learned it. Much of the rest of bike riding, e.g. in a busy urban environment, goes beyond that, and people are to various degrees reluctant to accept the necessity of learning this further skill-set. They demand the right to be allowed to do it their own way very much in the way that children do; you're effectively disturbing them at play.