Fanboys are not the same as people flaunting wealth. I generally see fanboys as advocates for the product and its feature sets. There is no doubt a lot of people by iPhone because of the image of wealth it displays and because it’s an easy decision if you have disposable income from a “set it and forget it” standpoint. The green vs blue text nonsense illustrates that clearly.
It’s like buying designer handbags. They’re still functional handbags and you don’t have to think about it. But it’s primarily about what the brand says about you. I just don’t consider this the domain of “fanboys.” Like I don’t describe Nintendo fanboys as people who buy Nintendo to show off they own Nintendo products. They buy it because they are staunch advocates of Nintendo and its games, as well as generally unable to critique the company or any of its products, usually electing to constantly talk about how everyone else is terrible and Nintendo is perfect and loves them.