I have mixed feelings about this. I don't think it's necessarily rude since you aren't (necessarily) detracting from the experience of the people around you. It may be rude to the speaker, but it's become common to the point that I'm not even sure about that.
Also, I noticed the use of "between you and I." I really hate this. It's incorrect, and I see it everywhere. Can we put a stop to this? I know this is a bit nit-picky, but we jump all over "your" vs "you're." This is the same, but it's a more understandable mistake.
"...and her message. And you’re hurting the presenter, since the message you’re sending to them."
'Her' then 'them'? I feel like whenever people put "her" when it's not defined, they are actually pausing or backtracking to purposefully place 'her' where they'd normally place 'his'. Much simpler would be 'the' or 'their', in this case.
Also, I noticed the use of "between you and I." I really hate this. It's incorrect, and I see it everywhere. Can we put a stop to this? I know this is a bit nit-picky, but we jump all over "your" vs "you're." This is the same, but it's a more understandable mistake.