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Alright guys, it's been 3 years but it's time to use it again.
Go to the bottom right of the screen, Settings, Filters and Post Hiding, Enable "Filter and Highlight specific posts", Edit, and add this rule:
/-[0-9](...).*\.jpg/i
In Type, select filename, check "hide" and Save the rule, then save settings. You won't have to see his trolling attempts anymore.