Personally, I think it would hurt his seller profile more. He can always forgo reviewing so the seller can’t review him in return and therefore go on with his terrible bullying ways.
There are still flaws in the review system.
I’ve either stop reviewing sellers or for those I know who are good with it, I ask them not to do one for me. I give them a snapshot of what I wrote, so their minds will be at ease (far as I know, there is nothing in the TOS that says I can not give the seller an advance peek at what I wrote).
Of course, they have to wait 10 days for my review to pop up. Even though most of them are repeat sellers of mine and really good at their job, it’s still gotta be frustrating to have a blind review system in place. You never know when a buyer will go on you.
Edit & Off Topic: I just love that bee with the pencil and megaphone! It’s so cute!