Do you think this was fair?

My friend is a seller on Facebook Marketplace. This guy wanted to buy something from her, but he got into an argument with her and ended up not buying it. Then he left her a bad rating! Do you think it's fair that he should be allowed to do this?

I think it's totally unfair. You shouldn't be able to give a seller any kind of rating (good or bad) unless you actually buy something from them.
Do you think this was fair?
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