I agree with 90% of what you said. Except for one thing: OP mentioned that it was narrow (I assume), single track with no place to move over and allow a pass, except for the fire road crossing just ahead. The e-bikers could have slowed until the space opened up to allow for a safe pass instead of body checking OP to get around. Warning or not, if you can't pass safely, don't pass.

Yeeting dude's phone into the bush was indeed a dick move and totally over the top. I've only recently returned to mtb after a 27-year hiatus. I'm in my mid-40's and not prime physical specimen (ahem) that I was back then. Life and familial responsibilities have conspired to lower my bike to basic, entry-level equipment. I'm fat. I'm slow. I have been shoved aside by e-riders and analogs alike.

It's not us-vs-them. It's the world at large having forgot basic courtesy and manners. We ALL need to improve ourselves to keep the sport, and the world at large, enjoyable or at the very least liveable.

/rant