I think I see both sides to this (btw, not saying I know what happened with the original incident).
On one hand, remonstrating a driver can have very unpleasant consequences; they are in a vastly bigger powered vehicle, you are on a very exposed bicycle. As much as you would like to give somebody a piece of your mind, is it worth it? Is it even something that would make a positive difference and even likely make the driver behave more responsibly?
On the other hand.... are we to meekly accept and implicitly condone selfish and unsafe driving by remaining silent? If we don't make a statement, will that mean that same driver won't think twice about doing the same thing or worse again, doing all of us cyclists a disservice? And if we do remonstrate, surely it is entirely unreasonable for a driver to use their automobile in a threatening and/or dangerous manner?
I still am trying to get to grips with both sides of this..... but I would say about 99% of the time I don't remonstrate, don't even raise an eyebrow or a finger. Why? Simply because I'm far from certain that any form of reaction (no matter how reasonable) will be positive, and is more likely to be hugely negative (and I don't want to argue with an automobile thanks). And while I said it would be unreasonable for a driver to use their vehicle in a threatening manner, the problem here is I'm not sure who exactly is reasonable behind the wheel!
OK, the other 1% of the time? I'll freely admit that there have been a handful of occasions where I've just plain reacted based on dangerous driving, a seat-of-your-pants kind of reaction that happened so quickly I barely realized what I'd said after I heard myself. Sometimes -at least for me -you just react.
But certainly short of a cyclist directly threatening and being a very real and imminent threat to a driver's life, there is no way, nor any excuse, good enough to warrant driving into a cyclist deliberately (again, not sure this scenario played out here). Even if they do have the audacity to complain or swear, or even berate.