That's not true, the Quincies consider hollows as their natural enemies because they have some kind of a natural advantage over them and that makes them fundamentally dangerous for their species. However from the point of view of the hollows themselves they don't give a damn about the Quincies. If they already would already consider someone a natural enemy, it would be the shinigami, not the Quincies.
They are neither prideful. I find it quite comical that you describe them all of things as 'prideful'. Countless or Arrancar joined the Quincies, more than one out of complete fear (referring to the guy who said he would join Kirke so long he could live, but was consequently killed) and would have no issues whatsoever killing one of their own for whatever shallow reason. They are by their very definition NOT a prideful race, in fact they are the complete opposite of it. They are the embodiment of insanity and chaos. Aizen brought some unification and Hallibel and Barragan after and before him, however overall they lack any kind of structure. The shinigami are organized in a very strict hierarchy and were trained for years to fight for SS and to protect the human world. Hollows are the complete opposite of that. Unorganized, selfish, before they become Arrancar they even devour hundreds of their own kin and they don't doubt much in working for Quincies or Shinigami. How the hell are they prideful? Sorry, but that's just a joke. There are some specific individuals who have shown a certain sense of pride, like Grimmjow, and as I said those might help him. However as a race, if they would have already have any pride, it pales compares to that of the Shinigami and Quincies.
They already got killed off by the Quincies. For so far they had a leader, Hallibel, they have none anymore and Hueco Mundo was even confirmed I think pretty much conquered. Or they died or they fled or they joined, but rarely any of their choices was based on a sense of pride.
I referred to them as foot soldiers considering the term 'fodder' has been used far too excessively and its meaning has got, plainly said, brutally raped on NB. So I like to refrain myself from using it too often. There is no particular reason to believe that the one Bambietta killed was particularly weaker/stronger than the ones who served under Kirke. These were enough to keep average Arrancar at bay and so far, during the current battle, no average Quincies have appeared. They're all Sternritter, so if the already got captured by average Quincies, what are they going to do against the Sternritters? Why the hell would they risk their lives? For Shinigami of all people? Highly likely most Arrancar and hollows got hunted down during their life more by Shinigami than Quincies. Most of them probably haven't even met the latter ones till now. Why would the majority of such selfish beings go to war against the Quincies who are fighting against the Shinigami, the people who have been hunting them for ages?
As I said there will be some Arrancar that will help whether it be out of pride or a certain feeling of friendship, however it would be extremely illogical if they would do some kind of a massive Arrancar counter attack unless someone would be pushing them forwards.