Sometimes I have been talking with a friend and one of us says something that sparks a question in my head. The urge to look it up is powerful. Yes it's rude but so is verbally interrupting in order to share the thought before the topic is gone. I mention this not as an excuse but to say it doesn't necessarily mean they aren't interested in what you're saying, and sometimes they're still listening even though they're look at the phone.
Also "inslut" includes an example of its own meaning.