Although I like the suggestion in general, but it seems @OP opened this topic because he received a negative feedback from high ranked user. 
What's the relation between post quality with positive and negative feedback? it's incorrect to use positive feedback and negative feedback because of qualify post.
Ignoring them is nothing different to ignoring a problem instead of fixing the problem.
It's not enough, they can still post in other non self moderated thread.
They are mostly from a few specific countries, which I won’t name, but some of these local boards hand out merits like candy to all their buddies. It is borderline abusing the merit system.
Unfortunately, many people will say it's "sUBjeCtIv3" and we can't do anything if we didn't find their connections with hard evidence.I think some of the measures already put in place to curtail these excesses are the "report to moderator" button and the trust system, which includes positive, neutral, and negative ratings.
Even you've report the post, there's no guarantee the post will be deleted especially if the post is long.What's the relation between post quality with positive and negative feedback? it's incorrect to use positive feedback and negative feedback because of qualify post.
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Instead, you can use the ignore button for those specific users if their comments bother you so much. One other thing you could do is whenever you create a topic, you could self-moderate it by deleting comments that aren't useful or helpful to the conversation, thus keeping it clean and maintaining a meaningful discussion.
\Ignoring them is nothing different to ignoring a problem instead of fixing the problem.
It's not enough, they can still post in other non self moderated thread.