Not aiming to be pedantic, but that dash-cam car seemed way too close to the cyclist at the start; there wasn't enough space to over-take safely and there were also narrowings ahead. Really not a good idea to be over-taking..better to stay back and "give cyclists room". If the cyclist had slipped or tumbled they'd stand a good chance of being over the bonnet or under wheels.
Claim you were ready to pull in after overtaking the other cyclists. But there is no evidence you ever pulled in at all even when there were absolutely no other cyclists to pass. You are just a small minded lycra lout.
No, the prick in the car shouldn't have behaved the way he did but there has to be some give and take and courtesy on all sides.
You know what people like that really hate? Exposure. Dash cams and police reports expose them even more :) If they do it again and if you didn't do so already, lock your doors and slow down in order to increase the thinking distance in the event of a collision. And a rear-fitted dash cam is most welcome on here, trust me. It also makes it much harder for them to excuse their behaviour. Don't let it put you off enjoying your journey, all the best :)
White Mercedes-Benz, right?