I'm a former moderator of /r/nycbike on reddit and I can attest, a lot of cyclists hate ebikers because instead of seeing an ally against car culture they just see one more "other" with whom they have to compete for limited bike infrastructure space, who they feel goes too fast in those spaces, and they think isn't enforced against enough. I hate to say it but just like most groups of people, a lot of cyclists aren't able to step back and appreciate a shared struggle. They don't realize that they're doing the exact same thing to ebikers that car drivers do to them. They don't realize that the limited space they're fighting over is an arbitrary restriction. They don't realize how legislating against ebikes is just a wedge, the tip of which is destined to cut them too once driven too far. So while I'm sure a lot of the detractors in this thread are legitimate car brains, I wouldn't be surprised if just as many if not more of them are subscriber cyclists who maybe need a reality check.