Well, that just stinks. I mean it smells really bad.
I watched the video, read the comments, resteemed and upvoted. That's about I can do as a real newbie.
For the record, I still think decentralization on this platform is a good thing. You are right, this is a cyber bully, and you are the temporary target. From my perspective it really looks like he's trying to restrict competition to his approved service. That never worked out in the old Western movies from when we were kids...
I believe there is some recourse. I think I saw something about conflict resolution (If you believe you were improperly flagged or down voted...) but I don't remember exactly where I saw it. A cursory search didn't get it, I'll look further and let you know.
I think if it were me I'd try to get this in front of a witness. I haven't been here long enough to have a real recommendation but I have a couple of names: Tim Cliff @timcliff and Mahdi Yari @mahdiyari. Both seem genuinely interested in the platform and how it runs and breathes.
I wish it were more. Don't let them grind you down. We need you here.
All the witnesses are very aware, but there's nothing they can do except push people to constantly use their voting power to flag his posts and comments. Until a new hard fork changes the way the rewards pool/voting power works, this is the system we live in.