New technology often dictates the need for new etiquette. Today we have so much new technology it’s hard for etiquette norms to keep up.
One pet peeve of mine that I think should be frowned upon is texting, or any other mobile device distraction, while in a live conversation. In addition to being rude it detracts from the ability to communicate. The person texting is less likely to comprehend what is being said while the speaker is often distracted by the texter not paying attention. This is particularly true for important conversations, such as if the conversation is a creative collaboration, regarding a decision, or for relationship-building.
For sure don’t text and drive. But also consider giving more attention to the person physically in front of you rather than those on the other end of the electrons. Don’t text and talk.