Sometimes other road users cause me to brake sharply. Usually, my reaction isn't to shout, and continue shouting after I've come to a stop. Usually, my reaction is to mentally tut, then consider whether I should have a wholemeal cheese sandwich with raw onion rings and some Branston pickle for lunch, then notice a girl's nice bottom. I know which reaction is less likely to induce stress and aggro.
On the bridge overtake Gaz shouts "Yes!" when the driver stops. Gaz got the reaction he hoped for.
I'd like to watch that bridge one again, I don't recall hearing the yes. I'd agree that's not great, but IIRC that was from the earliest of his videos, and he doesn't seem to have reacted like that for some time now.
To be fair, when I got a Scooby getting flashed by a speed camera after tailgating me, I yelled out a loud cheer. Schadenfreude like that is fairly normal behaviour, I thought. Alex on here, amongst others, has been known to express joy at camera flashes catching out some twit in a car.
For myself, I get lots of compliments on how calmly I react, and I'm bemused by this. I see that nearly everyone else reacts immediately with shouting and swearing, and that's not just camera cyclists, but many people, including a number of yacf riders. I don't feel able to judge them for this, because it seems to be normal human behaviour. I think an angry reaction is totally understandable in the fight or flight response. I also think you're forgetting that you're not experiencing that response when you're watching the video, so then you end up making a misjudgement about someone's reaction on video.
Going on too long could best be described by totally losing the plot when it came to that long haired chappie with the van and trailer in SonoftheWindsInc video. Now there, IMO, was a serious problem that perhaps needs counselling. If you want cyclists that react badly, then take a look at these channels:
20cfog
testeranimal1
SonoftheWindsInc