Earlier quoted context omitted.
As an Android user I've asked a very similar question before to my iPhone friends, and most of them are just apathetic and don't care either way, but some of them will actually say some variation of: "if somebody is on Android, I don't want to talk to them anyway. It's a useful filter." The first time I heard that it was a little shocking, but especially with Gen Z, it's a minority but not unusual opinion.
I feel like this is something way more talked about online than actually occurs IRL. I didn't get an iPhone until the 13 (2 years ago?) and I'm still on it. Nobody stopped talking to me because I had green bubbles throughout my, I dunno, 10-15 years of Android phones. They would make fun of me for how reactions (Bob laughs at $reply) looked on my screen but just friendly jabs. I am a millennial though.
But that said, how do you know nobody stopped talking to you because of it? One of my friends (who is early 40s) said his family started leaving one of their family members out of the group chats because it "degraded the whole experience" and I doubt he ever told the person he was being left out, let alone why. I would imagine it's kind of like telling somebody that you aren't going to date them anymore because they're not attractive enough. Not something you want to admit, and even though it obviously happens, I've never heard of somebody actually being told this.