Ad hominem would be saying "we need to cut taxes because pat is an idiot "
Telling someone that you have a fanboy username so take everything you say as something someone with a fanboy username would say is good sound advice and no attack or deflection of any point. Let alone an insult
Yes it is a form of ad hominem - akin to an appeal to motive or possibly poisoning the well in this case. Which can be legitimate, but a d&d username by itself isn't enough to question the truth of the statement. For example, I don't have a d&d username and happen to agree with his original point :P
UnfairRepresent is a well-known troll around here, I thought people just learned to ignore him by now ---
"I'm the straightest guy on this board. I'm so straight that I watch gay porn." - Smarkil