I do exactly follow the no-hello "rules" but I frankly don’t care about how my colleagues reach me. We are humans, they can just say hello. I’ll answer or not d

I do exactly follow the no-hello "rules" but I frankly don’t care about how my colleagues reach me. We are humans, they can just say hello. I’ll answer or not depending on my availability but even if I answer and they don’t follow up, it will not ruin my day. If I don’t want to be disturbed, I just switch the notifications off. Magic, no more hellos. I really don’t understand why it bother people so much. And I’m saying this having strong ADHD and applying no-hello myself. There are so much more important reasons to be upset in life and at work.