No, you can't ... and only a Nadal fan would say so.
But, truthfully, with the top men I think you can find a spectrum of fans, good and bad. Even though I'm clearly flying in the clouds with the Golden Eagle (and it's not just the economy-size bottle of wine I consumed while I watched DVR'd Olympics matches), there are some fans of Roger on this forum that are clearly more annoying than some Rafa fans (though they're an exception to the rule, thankfully!). No, we don't necessarily need another thread on how Roger holds the record for most consecutive matches won while wearing a red polo, though I personally would become giddy over that statistic.
For example ... guys like MichaelNadal who can applaud a good performance from his favorite's rival or Mustard, who can provide some cool objective stats on an array of players, past or present. From the merits of their posts, I can respect their affiliation, even if I don't root for their tennis hero. But then they're sometimes overshadowed by someone who will create 20 alternate accounts so he can spam the board with obsessive posts about how Nadal will win the next 52 French Opens without dropping a set. (I'm not naming any names, but that's mainly because I'm not positive of the moniker of the latest alias).