I think we hang on first and see what happens. I am thinking to use the #sbi-skip for some of my posts and focus sbi votes to just once or twice a week. I don't know if it would work but since the hater now has a huge SP, I do not want to be downvoted by him on every post that has SBI votes in it. And it is especially unfair that his downvote value is so much more than the SBI vote itself. What an abuser.
If you have the time, take a read here:
https://steemit.com/sbi/@tristancarax/steem-n-roses-my-response-to-the-attacks-on-the-sbi-community-as-a-whole