There's no excuse for any road user acting like an a*** but I must admit I have a lot of sympathy for road users in that neck of the woods, even taxi drivers. They've endured months of jams with the net result of a piece of cycling infrastructure that is, to be perfectly honest, sh**e. What was the point?
From a personal point of view, I get on quite well with motorcyclists. I cycle down the middle of the line of the South Circular but always keep a look out for motorbikes. If I see one behind, I pull back into one of the lanes of traffic to let them past. Usually gets a smile and a wave. Occasionally I'll come up behind one who isn't confident of getting through a gap and I politely ask them to get out of the way.