Unfortunately their arrogance isn't false bravado. iPhones brand is extremely strong. Funny aside I know many women who won't date men who's text come up in green bubbles... thats branding.
I believe you -- though it's not surprising in the USA. Apple absolutely dominates the US market. I'd estimate of the top 75% of incomes Apple has at least an 80% market share. I live in a high-income area and the only Androids I ever see are carried by my house cleaners. And among young people it's only more intense because teens are so obsessed with brand cachet (as they always have been).
Now, on HN we know some people, though plenty wealthy enough to afford Apple, are choosing Android for function. But I doubt most of the public even thinks about that choice through that lens. Green bubble is the same as arriving to pick up your date in a 2002 Civic. It projects "I'm probably broke." Statistically. In the US only.