Swiping through more photos than you should
When someone hands over their phone so you can see pictures of their new dog, or their trip to Delaware, or whatever Gremlin-like creature they spotted on the subway that morning, there is a certain code of conduct that should be observed. And it is this: STOP SCROLLING WHEN THE CONTENT CLEARLY CHANGES.
Look. We're friends, but that does not give you license to swipe through my entire photo album. What I choose to privately share with my, uhhh, dermatologist is my business, thank you very much.
Leaving your keyboard clicks turned on
For the love of God, turn off that abominable clicking sound. Do you really need the aural satisfaction of hearing yourself text "haha nice"? If you’re trying to channel a simpler time when everyone used the typewriter, please just leave us out of it and call Tom Hanks.