I guess my only experience with a breeder who many would have considered rude, was many years back when I called a breeder about Tibetan Mastiffs. I told her why I was calling, and first thing out of her mouth was "I don't want to be rude, but do you know anything about large dogs?" I replied that I had just had a St. Bernard die at the age of 10 from a heart condition. Her response was "Okay, do you know anything about more aggressive dog breeds?" I replied that at that moment, I had a Rottie and a Dobie. Finally, she said, "Okay, I'll talk to you, sorry about all the questions, but you wouldn't believe how many Terrier owners or lab owners call me, wanting a pup then get upset because I won't sell them one." We talked for a few hours after that, and it finally came down to me not being able to afford 5 digits for a puppy, which she fully understood, but kept talking anyway.
At first, she was the rudest person I'd ever talked to, but in the end, I realized that it's her time and that people who think T.M.'s are big teddy bears, who are wasting HER time.
Actually, I did also talk to a Fila breeder who wanted references as to what kind of dogs I've had before he'd talk to me, but once again, it's not a dog for everyone, and why should they waste their time talking to people for hours, when that person can't have one in their center city Manhatten apartment, as a lapdog?
Both of these breeders said that if I hadn't answered the way I did, they would have politely told me to go buy a book on the breed, and they'd be happy to answer any questions I had about what I read in the book if I was seriously interested, but both of them said they would never sell to anyone who isn't familiar with large breed, aggressive dogs, and to me, that's not rudeness, it's protecting your pups, and protecting their new owners.