I too have become a pet snob.
It didn't start all at once. First of all, when the expansion came out, I went to level my character, I arrive in Jade Forest and lo and behold there are pets there that I can battle. I click on one and my lvl 1 pets get toasted. Ok, i have to lvl my pets first, how long should that take? Let's go back and start leveling my existing pets. (I had a mechanical squirrel, a pandaren monk and an Onyxian Whelpling). I head back to elwynn forest and start battling anything, but I realize I can capture these pets. I capture a black sheep, I capture a rabbit and then BAM! I capture a squirrel and the pop-up tells me it's rare. Whoa - that's cool. What makes it rare? . . . from there on, I was a snob. Only rares would do for me. . .
Until I learned that some pets are actually rare as in hard to find. Oh, you want a minfernal do you? HAHAHAHA - so after flying around for 4 days looking for one of those, I captured the first one I got, didn't matter that it was poor. Oh how I seethed at having a poor-quality pet among my rares. . . but it was a MINFERNAL!! So I calmed down a bit about the whole rare thing, decided that some pets would be good to have no matter what their quality.
Until I learned that some pets have different stats. (breed id) So you want a rare Kun-Lai Runt do you? well here is a Rare one with a lvl 3 ID. . . What? You didn't capture that one? You just killed it? You captured the poor one with an id of 4 instead?
That's when you know you're a snob, when you capture a poor quality pet because it has the right pet ID instead of a rare quality because the rare has that stupid 3/13 balance id which everyone knows is crap. (and yes, I used my stone on the poor quality Kun-Lai runt with the right breed, and now he's rare.
I'm a pet snob, and all that means is that i'm better than you. *holds nose in the air*