You want to know how it is an absolute likelihood that misinterpretation of speed is a likely issue?
My wife yells at me plenty when a car pulls into our lane of travel and our car creeps up on their tail. She too thinks I'm accelerating to intimidate...not so.
I too am in tune with local traffic, I often know when another car wants to get out of their lane because of slower traffic (if I'm lucky, I see their heads turning so as to actually look over their shoulders, you know, the right way, with preparation and forethought). My thought process:
1) Do I maintain speed and/or speed up: plenty of times this would put my vehicle into their blind spot just as they are making the critical decision to change lanes, I don't like to be in that blind spot position (see option 2). But, if I can safely maintain speed or speed up to at least get into their peripheral vision, I often do that. Hell, as a courteous driver, and if conditions allow, I'll make this move in plenty of time so as to allow you to slide behind me without you needing to brake, you know, for flow and less disruption.
2) The other option backs up my theory of misjudging speeds. Being in tune, I am often already off the fuel pedal for a second or two, cruising. The other vehicle comes over into my lane, initially with sufficient space. If he accelerates to match the flow, great, join the train, let's get to going where we are going. However, sometimes the sufficient space quickly disappears to tailgating distance, even though I am still cruising. This is where my wife accuses me of accelerating...WTF, you are in the car with me, can't you tell I'm cruising with foot off the pedal? Nope, the visual of the closing gap makes it my fault (ok, yes, ultimately I can control this distance, but that's not the point of discussion).
Go ahead, blame the misjudgment on her gender.

The blame game happens often enough when I let off the fuel pedal that I know other drivers are also cussing me out for riding up their tail, but little do they understand, I'm cruising. Keep in mind, this other car is still making ground on the car it is passing, so in his mind, he's doing a great job. But for the last number of seconds (the 1-2 as I started cruising (not accelerating) when I recognized his desire to change lanes, and the 3 seconds for him to make the lane change), I am still gaining ground on him. Of course he thinks I'm accelerating on him, but since I've been cruising for the last number of seconds, I know he failed to accurately judge my speed (or didn't give a damn all together... remember the "me only" comment and filling any gap regardless of surroundings?).
Their failure to match the speed and/or the lack of understanding/recognition of the real world physical implications of a speed differential and distance covered, makes me the AHole, why? It's human to read other's thoughts and intentions (sometimes incorrectly). Let the mathematical world also speak to you. This is what I'm trying to educate.