I don't doubt he is being a nuisance and it is bad for user retention, but that doesn't make him a bully.
You are assuming he doesn't understand how SBI works. My guess is he understands it very well, and you may just have a different understanding of sbi or more likely disagreement about downvoting.
You are saying he lacks intellectual capacity, he is lazy and a coward...that isn't anyway to reach an understanding or agreement.
I bet you will justify this as standing up to a bully, rather than confront SBI, vote trading and vote subscriptions which are the real issues.
Getting downvoted sucks. But SBI is hardly proof-of-brain. Reward disagreement is a legitimate cause for downvoting someone. You don't own the rewards until post payout.
To be clear, I would also like to see him stop, but there is an obvious need for a discussion here. To dismiss it as bullying and attack him without addressing the root cause is also lazy.