Real world peeve bordering on actual anger: people who think that you are being rude because you can split your attention effectively and multi-task.
Sure. Maybe once upon a time this was rude. But then we got into this information age happened where instantaneous communication basically anywhere on the globe became a thing, and then it became a necessity.
Millennials do this by reflex. We learned it as a survival skill in a world that demanded this skill be a thing. We can split our attention between two, three, sometimes even four things at once and keep them all effectively in mind. We have been doing this for ages and ages.
The people who think this automatically means you aren't paying attention to them, and are thus being rude to them, are people who have no comprehension of how this skill works, how it is exercised, or why it is necessary. My generation does this daily. Hell, even most Gen-X-ers are halfway decent at this, because they work in fields where the information you are getting and the information you actually need are different things, and you are expected to be efficient about this. (Paralegals have always fucking rocked this skill.)
I can be listening to you AND looking at some relevant reference material AND writing down questions I need to ask you later, and I can repeat back everything you just said to me. Maybe not verbatim, but the important shit is all there.
I'm sorry that the reality of the world demands that I split my attention. But I can do it just fine. Quit telling me I'm being rude by doing what my bosses, etc., expect me to be doing. And if you think that's rude, then... I dunno? Sorry not sorry.
Not directed at anyone in particular. Just saw a thing about this and, like, needed to get that off my chest.