To reiterate, “I’m busy” is different from “I have a few minutes to talk/listen” or “let me go to a space where I can hear you.”
The “I’m busy” are the same ones complaining about lack of attention/communication when it’s their turn to need someone. If someone tries to reach out, unless you’re at a job/work where you’re not allowed to communicate, or communication is limited due to location/signal, take the 5 minutes to talk. Your 5 minutes can mean a lifetime commitment to someone else. Remember, we all have the same 24 hours in a day; how you use them is up to you.