Why are some people so self-righteous when it comes to their pet's diet?

Personally, I started feeding my 2 siamese cats the Royal Canin Siamese 38, which I'm sure is about the most expensive brand available (maybe just slightly under Wellness). The only reason I like Royal Canin is because they tailor their foods to different breeds of cats and dogs to meet specific individual needs. I tried Nutro, Science Diet, Purina, and they all had not very good results. This food is shaped so my cat can't gobble it down and throw it back up later. I have also noticed that my cat's (who used to constantly have diarrhea) diarrhea episodes have been drastically reduced. And, to be honest, these cats are very expensive and top-of-the-line pure-bred, so I want to keep them alive as long as possible, so I think its a bit more worth it to give them good food so they live a little longer. I do have to agree that most "premium" pet foods are a scam (don't every buy science diet!), however I feel very different about RC. I'm a bit like you in the sense that I hate it when people rag on me when I ask a question (Like where can i get the 15-pound bag of the RC i like?) and they say I should be feeding my cat wellness or a barf diet (that doesn't even sound appetizing). If the brand you feed your dog works for the dog's health, by all means don't fix something that's not broken. In a sense it's kind of like when people who own Mercedes-Benz's (atleast in my area) seem to think it's alright to cut people off in traffic {but, no, it's always the fault of the person driving the cheap ford}, they always have the right of way, they can go a little faster than everyone else, etc.--some people just feed their cats these "premium" diets because it's a status symbol, because they like to say they can afford to feed their cats "gold" and use $50 bills as toilet paper (but don't want to sound tacky, so they say they do it for the animal's health). I'm not feeding my cats the food they get for the status.