I asked if people chose iPhone for the blue bubbles elsewhere a couple days ago, and while there was some good discourse on that post, the blue bubbles definitely also came up as a reason.
In my experience, when people find out my texts are green, they oftentimes would rather switch to a different platform altogether like Instagram or just not text at all.
Is this actually a deal-breaker in friendships out there?
This is the key. Different products are intuitive for different people. Some people prefer less customizability with less barrier to entry. I recommend Apple products for a lot of users even though I strongly prefer Android/Linux/Widows. I also strongly prefer the Mac trackpad and gesture support. I use a Mac laptop for anything not work related because I hate the way trackpads work on Windows (even using the superior Mac trackpad).
All that said, if someone else prefers iOS, or Windows trackpads (or even likes those awful little buttons on Lenovos), then they should use them! Use what works for you!