I wonder why people think it's polite, because I consider is the exact opposite of polite to distract someone with something that may not lead anywhere. It mig

I wonder why people think it's polite, because I consider is the exact opposite of polite to distract someone with something that may not lead anywhere. It might be just my ADHD talking, but getting interrupted by a "Hi" can be seriously disruptive because my brain wants to respond to it, but I then have to wait for the other person, and they might not respond immediately, and by then I've already lost focus on whatever I was doing which is immensely frustrating. If instead I'm prompted with a "Hi, can you chat about X?" I can immediately respond in a way that satisfies my brain without losing focus on my ongoing activity.