The same percentage of the populous is assholes no matter what the slice of pie we're viewing is. The same qty of people that drive cars are a-holes and drive like it, the same qty of hikers are a-holes and act like it, the same qty of human powered bike riders are a-holes and ride like it and lastly, the same qty of e-bikers are aholes and act like it.
I can't say that the % (of the total) of ebikers that are being idiots is any different then the same % (of the total) of strava addicted aholes riding regular mtb's like douches. Entitlement and american cultural breakdowns know no categories and definitions. We're all in same fishbowl lamenting at how low the common denominator can be. I'm not at all commenting on if/where/when ebikers should have access, however I think projecting that an ebike instantly means ahole and inconsiderate is a bit of a cop out to simplify the issue and entrench ourselves in our own confirmation biases.
All that being said, yeah, being informed by a park ranger that you're doing something wrong and then just doing it despite that, makes you an ahole. Climbing the luge on an ebike makes you dumb, and likely also an ahole in most circles. The real shame in this is that there is no way for us to integrate, educate and take advantage of the influx of people this technology is bringing into the sport, that is, other then santa's village and maple springs.
While Santa's Village seems to be ground zero for ebike and normal bike integration and it's with a mixed degree of success, I can't say that the ebikes are the straw that breaks the camels back in terms of congestion and people being inconsiderate and mindless up there.
Me personally? I think the number is somewhere around 30%. Seems like every where I go, 30% of the people are a waste of my time, and Aholes.