Backseat-admin
A member on a web-forum acting as if he or her is an admin, without being so.
John: Look at this video "inappropriate-content"
Bob: That is blasphemy! Have a nice holiday!
John: Oh, please Bob, stop being such a Backseat-admin.
Bob: That is blasphemy! Have a nice holiday!
John: Oh, please Bob, stop being such a Backseat-admin.