In some markets it’s pretty close (US teenagers for example).
You don't use the right back end, therefore you aren't cool.
It's absolutely absurd. I mean, about on par for teenagers, but gah... I can picture the conversation about "Your "friends" are complete morons, and you shouldn't feel ashamed or ostracized at what is probably one of the most silliest social signaling practices on the planet."
It hurts being an engineer sometimes. These networks are marvels of human ingenuity, and people take them and use superficial differences in UI and completely miss the point.
God bless. I keep thinking UX/UI can't get any worse, but what humanity takes out of it never ceases to amaze.
Ha! They're teenagers. They will invent new divisions as needed.