Folks that get pissy about an ebike anywhere outside of a formal race setting need to get a life. I could maybe concede a groomed MTB trail system too, I'm still 50/50 on that, just from the fact that if you aren't fit enough to pedal a MTB trail, I question if you are fit enough to zig zag and descend a MTB trail system.
For the most part, none of my business how anyone else spends their recreational time or what they choose to commute on, though.