As for the Video. I reckon this was rigged by WAFI's as it does look staged.
From my experience of WAFI's there are some that get extremely upset by the littlest of things.
I travel though Haslar Marina when I motor from or back to my slipway. I always try to create minimal wash but sometimes on a Spring ebbing tide the tide can run at 6 or 7 knots so with my SOG at something like 3 knots I'm creating quite a sizable wash (or bigger than I normally do). There's nothing I can do! I have to get back to the slip before it drys!
I can guarantee you that someone from a Yacht or the pontoon makes some sort of comment. I've had sailor boys saying that I'm "going to swamp boats" and that it's "dangerous"
I've had it all over the years!
I've just come to the conclusion that some of these WAFI's are a bunch of moaning old women that have taken up sailing to ease their stressful lives.
I guess it's not working for some of them.
But the majority of Yachties are fairly decent people. But like all things in life it's the minority seem to have to say.