Did you ever consider that they're not offering those social cues because they're not interested in what you have to say? You sound like you're having a one-sided conversation with a wall and then getting mad that the wall isn't paying you the "proper" respect. I have never been unsure of whether someone was listening to me with AirPods. If I was, I'd ask them and would know immediately or else I wouldn't waste my time. Not everyone has to hear what you have to say.