He said 'pathetic lifeform', not 'pathetic species'.^ We also know that Obi-Wan is a racist.
"I see we've picked up another pathetic life-form..."
When I first heard that line, I remember thinking, "What an awkward way to phrase your feelings about taking Anakin aboard!". It's creepy enough that Obi-Wan is essentially saying "duck-billed aliens are inferior", but he's lumping a little HUMAN boy in there with our favorite dinosauroid comic relief. Isn't Obi-Wan human, as well?
Lifeform's an individual judgement. Obi-Wan considers Anakin and Jar-Jar kind of pathetic. What he thinks of Gungans and humans as races is another question, although it's true Obi-Wan generally doesn't seem keen on the residents of Otoh Gunga either.
Yup.