This is an unusual argument, after many years of "Why does Djokovic always draw Federer in the SF"? Are Djokovic fans now complaining both of always drawing Federer and always drawing Nadal?
The argument was that Djokovic must go through Nadal in order to be seen as "better on clay", considering Federer's many RG finals. Well, Federer made those finals because he didn't have to go through Nadal. If Federer had to go through Nadal to make an RG final (like Djokovic had to for many years), would he get to the final? No, so why is Djokovic being asked to do something not even Federer would be able to do in order to be better on clay?
One man stopped Federer for 5 years just like that same man stopped Djokovic for 4 years.
Djokovic at his super absolute peak lost in 2011 against 30-yo, over the hill Federer. That should tell you much who's better in clay.
And when "super absolute peak" Federer lost to "infant" Nadal in Dubai and Miami back in '04 and '06, did that tell us who was better on hard? Or does this logic about a player's age only apply when it benefits Federer?
I find it rather funny how Federer fans hate it when Nadal fans bring up the H2H, but then go and do the same thing when it comes to Djokovic.