Posted by: thaaad
It's not about being friends... and it's less of an acknowledgment thing and more of a mutual respect thing. Basically the reason why turn signals and brake lights exist in cars, make people aware of what others (and yourself) are doing for the safety and consideration of everyone when you are in public.
I'm sure nobody appreciates being passed too close at too high of a speed on the highway. Just have some courtesy, let people know you are passing, slow as you go by and give both of you a little room.
It's really not hard at all to treat others with respect, ebikes, cars, sidewalks, whatever.
This ... and it also applies to ebikes tailgating me when I'm huffing my way up something like the GSM climb. My goal is to be able to clean that climb regularly without stopping, and I don't need some dumbass with their high pitched motor whining away, nipping at my back wheel as a not-so-subtle hint that they want me to stop and let them pass. Trust me, I know you're there, and if I spot a wide part of the trail where you can fit, than I will hug the edge and let you pass. Until then, stay the hell back and wait your turn. It's similar to the logic for the "climber has right of way" rule when passing on a bi-directional trail. Climber gets to continue because it's much harder for the climber to stop, reset and restart than the descender. The ebike can stop and restart more easily than the non-e-climber.