Definitely the lorry driver is to blame. As would the driver of any other vehicle be to blame when performing the so called courtesy. I know we've had this discussion before, but it really does bug me when people pull into the next lane to allow someone to enter from a slip road without giving a thought to the numerous possible negative consequences.
I agree. Not moving may seem discourteous but the problem is it's become an expectation of drivers joining a motorway that someone will move out of the way for them which is the opposite of what the highway codes says. Responsibility is clearly with the joining driver to match speed and slot in to a gap. In any case sometimes you can't pull into lane 2 but that won't necessarily stop some of them driving at you. I've had a very near miss when some half wit just expected me to disappear when I had no where to go. Talking of half wits, if a string of them come down the slip road nose to tail how do they expect to be able to join the traffic stream in safety.