http://www.equestriadaily.com/2014/06/someone-insulted-luna.html#idc-cover

Can I ask why is this even posted? I ask why? For all I know this could be a troll but thinking that this could be a opinion on someone, its just an all time low. Worst is that comment had like over so many replies and I think by now its gone as I check that video and its not there. Must of been remove. Seth you really think this is funny when in really it shows how much of a big shot idiot you are.

He's making a joke at the expense of the enormous Luna fanbase that follows EQD. Luna wins all the polls, for instance, so he's going, "Here, someone said something bad about her, go get 'em!" and trying to rile them up.

So yes, it's trolling.