Sigh, I don't believe you lot. Matthew's thread title sums it up perfectly. He clearly admits his error, so everyone getting on their high saddles with advice after the fact is a bit tiresome. But what's with all the victim blaming? Making a positioning error in traffic is something we all do from time to time on bikes or in cars, but it does not, repeat not, make it OK for other drivers to then behave dangerously.
Now I know this forum divides sharply between those who like to 'have a word' and those who do not, but that's another debate altogether. Given that Matthew is one of the former, as I see it he is entirely reasonable in questioning the driver's subsequent behaviour - especially as he admitted fault for his own error.
Victim blaming appears to be a big crime on this forum . . . unless the victim is Matt.