Is it time to start calling out bad cyclists?

Ideally I'd be behind that particular vehicle rather than on its left, but it often just doesn't work out that way. on the road you have to judge the position you're in, not always being able to see three steps ahead.

I disagree. IMHO if "it often just doesn't work out that way" you are doing it wrong!

I think we can all agree that if it is any kind of "long" vehicle we just MUST NOT go there unless we are 150% sure that we have time to pass it fully before it has ANY risk of moving.

For normal shorter vehicles (i.e. cars) we are only talking about anticipating the next 20 feet (max!).
I really can't think of any instances where I have incorrectly anticipated whether or not I could safely filter up the left of a car and become trapped to the left of it.

Of course there have been many times when I COULD have safely filtered in retrospect but I have CHOSEN not to either because I can't trust the nodder cyclists in front of me or because I don't know the light sequence.

As a result I end up sat in primary waiting like a car WAY more than your average nodder.

Perhaps I am just too conservative but the thought of ending up stuck to the left of ANY 4+ wheeled vehicle at a junction or lights, scares the crap out of me.