I used to have weekly meetings with someone who would check her phone every 5 minutes for text messages and emails. Finally after a few months, one day, I brought MY phone and left the ringer on. When my teenager called, I answered and had a 10 minute conversation about what was for dinner.
After I hung up, she said, "You do realize that was rude, right?"
And I said, "No. I didn't realize. I thought we only scheduled these meetings so we could use company time to deal with personal communication."
I have no idea why she thought I was being sarcastic....