I thought it was an interesting piece, and I thought the Lakers' fan made some decent points.
My rebuttal to him would be that it's all fine and good to poke fun at the eccentricities of Celtics fans, but to keep in mind that, as far as I can tell, there is no such thing as a true Lakers fan. Anyone who calls himself a Lakers fan is generally a bandwagon fan by definition.
Of course, the few diehard "Laker" fans that exist out there (there must be one or two, although I've never actually met any) are surely living as much in the past as Celtics fans.
If they don't have some eye on the past, and are only Lakers fans until Kobe retires, they can't really be called anything but bandwagon fans, can they?
Luckily for them, they can always follow the Clippers during the lean years that are ahead, and as LA sports fans, they can have a completely clean conscience about it.