People are people and you'll find all kinds in all kinds of customer facing (or not) positions. This isn't something odd or uncommon or in any way uniquely related to Apple.
Well in a way it sort of is, most companies don't allow it's employees to have a personal problem with it's customers based on a customer's choice. It's my iPhone and if I want to modify it no reason to be rude, scream at me and then slam the phone in my ear.... And back then if I could somehow complain to someone high up at Apple or even Steven Jobs himself... Weird thing of it I'm sure they'd insult me and slam the phone in my ear lol...
Most other companies let's say GM, Toyota, Samsung etc etc.. They'd say sorry you customized our car / product and you're warranty will be voided and sorry... most companies would be mature about it and not take it so personal.... So what I jailbroke my iPhone 3GS in 2010... Didn't know much about smartphones back then...
I'm not sure if any of you remember... But in 2010 AT&T was overloaded on its network (this is back when iPhone was only on AT&T) When I updated my iOS I went from 5 bars to 2 bars and nothing I could do about it. I looked at other iPhones back then with the same latest iOS update and the signal was terrible as well.. So I jailbroke my iphone thinking I could fix and get my signal back to full bars.. Well I couldn't so called Apple and asked a few questions... Then bam...
I believe back then Apple purposely did something in its software update to dumb down everyone's signal to help out AT&T network...and at the same time all of this was happening I read an article that AT&T needed to upgrade it's network badly, but needed a crap load of billions of dollars and they were holding off for awhile...
AT&T network needed upgraded but they didn't want to spend the money and iPhones signals were worse after the iOS update..hmm... I'm pretty smart at figuring things out by putting the pieces together...unfortunately the masses are kind of stupid.