I'm in the US and have an iPhone but as I mentioned in another reply, I have friends with android and have never noticed any impediments to texting them... or them me? Is this a high school thing or are you talking about adults?
From people who don't know it's an intentional limitation by Apple.
aka, mostly nontechnical people.
Experiencing this sort of behavior keeps me from believing I am an understanding person.
Queue the onslaught of empathetic "get better friends lol" -- except I've seen this behaviour across so many social circles that even if it was a viable suggestion, there's no certainty the next group would be any better.
The phenomenon you're commenting on/describing happens often, perhaps is even common. But it is not ubiquitous.
Is this a good heuristic for acceptable behavior?