Keyboard Coward 

A keyboard coward is a type of Redditor that refuses to express their disagreements with posts, or comments within Reddit with their words. Instead, they would rather abuse the voting system within Reddit to mark their disagreement.

That user is a keyboard coward because they are incapable of forming their opinions into words. Instead this user uses down votes to show that they disagree with the OP.

Keyboard Coward by Nick Lotze March 25, 2016

keyboard coward 

Someone who reports social media profiles, pictures or posts.

What a keyboard coward, he should own up to what he did.

keyboard coward by rorosita May 9, 2016