I am a slash fan, but I thought that Rodney was so bitchy, because there was a ZPM around... and we know how much he's dying to get his hands on one... but instead of making a progress that stupid women didn't help and they kept just talking and suddenly everybody was trusting her and they brought her even to Atlantis... and no one seemed to see the possible threat she was in his eyes. On top of that Sheppard is smitten with her... and obviously hasn't a clear mind anymore. I can perfectly see why all this would have been really frustrating for poor Rodney... without the slashy jealousy.
I'm not sure if it's understandable what I mean? (It's later here and I should have gone to bed a while ago)