It's simple really
You need to decide if honoring your hatred of said player and team by not purchasing any of his cards individually is a higher priority than finishing your sets.
An option - per your statement you have purchased groups with his card in it in the past and felt better about that, so maybe consider buying groups with his card in it for the ones you are missing and sell off the rest of the group!
The above presumes the issue has nothing to do with spending hundreds to thousands on a card.
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