This is an interesting statement considering that Bella herself is an unbelievably huge hypocrite.
Sorry for the late reply.
Here is a list of some of the times that Bella has been hypocritical:
I. Bella is appalled that Gianna would want to become a vampire when she herself planned on and did become one. The argument against this is that Bella would become a "good" vampire since she wouldn't drink human blood while Gianna would be a "bad" one for drinking human blood. However, we simply do not know enough about Gianna or her situation to know for sure that she would choose to feast on humans.
II. Bella is annoyed with her classmates' shallowness despite being a shallow person. An example of her shallowness can be found in chapter one of Twilight when she first meets both Eric an Mike. When she meets Eric she finds him to be annoying and overly helpful and later with Mike she thinks of him as a loyal puppy that follows you around everywhere but decides that he was the nicest person she had met all day. Both Mike and Eric had greeted and offered to help Bella find her classes in the same manner yet Eric is annoying and overly helpful while Mike is so nice. The only difference between Mike and Eric at this point is that Eric is described to be an oily haired chess club type compared to Mike who is attractive. Therefore, Mike is labeled as the nicer person because he is better looking. Another thing to note about Bella's impressions of these two is that while many people also create similar superficial prejudices for other people, Bella never goes beyond her initial impressions even after getting to know them. Eric is always the overly helpful chess nerd and Mike is always the sweet, loyal puppy. I'll also throw in that Bella focuses a lot on physical appearances; the evidence for this is in how many times she mentions how beautiful and flawless she thinks Edward looks (which is nearly all the time).
III. Just at the mention of Tanya Bella becomes upset or jealous and yet she thinks nothing of all the hand holding and hugging that she did with Jacob, being well aware that he was in love with her.
IV. She is greatly upset and angry with Alice for suddenly leaving in BD, thinking that Alice has abandoned them even though she did the exact same thing to Alice and Jasper when she ran off to meet James in Twilight.
V. Bella soon suspects that Jessica is only nice to her for popularity and is miffed that Jessica is only using her. Even though she takes issue to Jessica using her, she has no qualms about using Jacob for information about the Cullens in Twilight and initially in New Moon when she starts to hang out with him just to keep Charlie off her back. She even uses Jessica in New Moon for the same reasons as Jacob, but personally I found it to be more of an eye for eye thing.
VI. Like Jessica, Bella is friendly (well, Bella's version of being friendly) to her classmates and participates in their conversations and spends time with them outside of school while inwardly writing them off as boring and trivial or only pretending to be interested in their conversations/activities.
Regarding Jessica's treatment of Bella, in New Moon she does agree to hang out with Bella after she had completely ditched her and everyone else for Edward in Twilight. I doubt that this was done for popularity because at this point Bella had made herself into a bit of an outcast among her peers and she wasn't really new to the school anymore so there wouldn't be much to gain out of hanging out with her. She more likely agreed to hanging out with Bella out of pity or even possibly to impress Mike, although we can't really know for sure.