Sorry to intrude, but it clearly says this when you click at the "flag"
(Disagreement on rewards)
Anyway, there are no real rules here, including flagging rules.. just rules set forth by stakeholders through voting.. and that includes upvotes and downvotes.
if you care about the platform do something about this abuse...grumpy cat is gaming the reward pool
https://steemit.com/@checkthisout/transfers
Thanks for informing @tt-dogg