Is it time to start calling out bad cyclists?

One issue I have with this thread is that complaints are constantly levied against a homogenised mass of so called 'Boris-biking, fluoro-clad, Cat 5 nodders'. The reality is that there are poor cyclists across the style spectrum, irrespective of the type of bicycle, clothing or sundry equipment an individual happens to sport. Heck, if you think Cat 5s are bad, you should see some of the dick moves pulled by Cat 3/4 riders in crit races.

I think this thread serves a useful purpose for identifying poor cycling and suggesting ways to tackle it, but I have come to the view that leaving out some of the name calling associated with it would be beneficial.
I don't call out jerks (red light jumpers, undertakers, etc). They're always either much faster than I am or not likely to take advise from a jumped up helmet, googles and gore-tex wearing nerd like me. It's the cautious newbies and genuinely clueless nodders going up the inside of busses and indicating vans that make me want to yell out. Fortunately that kind of event is rare on my route, but it's the only case that makes me want to intervene.