He can't. That's why he uses the tern fanbois (as if that was even witty at all). That term is typically used when they have no compelling case for their arguement and need that extra push to make it seem as if there were some weight behind their statement. "If I call them fanbois then people will think that I am a knowledgeable poster and will take anything I say seriously."
Never saw that term before. In fact, when I read it in the original post I mentally pronounced it in French -- "Fan-BWAH" -- and wondered what it meant! :ROFLOL: