Your generalization is another nadal fan classic.
I just pointed out your reasoning, and that it had nothing to do with tennis, but just with hating on a player.
'I don't like Fedal, because Nadal always beats Roger' (it's 18-10 btw, quite a lot of wins for the lesser player in a rivalry)
'I don't like Rafole, because Rafa always beats Nole, oh no wait, last year it was all of a sudden cool, when Djokovic beat Nadal'
'Fedovic is awesome, because it's a rivalry my favourite can win.'
Don't say you don't like one rivalry because it's too one sided, and then say the other one only became nice when the guy you didn't like ended up at the wrong end of an even more one sided rivalry.