Ending all your texts with a period
We’ve said it before and we’ll say it again: never end your one-word texts with a period. Grammar, vocabulary, punctuation -- all these are important things in life, but there are actual studies proving that using periods in texts causes recipients to perceive you as insincere.
Leaving the read receipts feature on to make some smug statement about your maturity level
Most of the time someone doesn't even realize they have read receipts enabled. But ever notice that the people who do it intentionally are some of the smuggest assholes you know? Like, they think they're more evolved than the rest of us because they wouldn't stoop to the level of ignoring or, uh, delaying their response.
Teasing someone with a typing bubble, then never sending the text
There’s something vaguely thrilling about watching those three animated dots that indicate (allegedly) someone is typing. Which is why it’s such an infuriating cliffhanger when they type, and they type, and they type... and then it suddenly disappears. What are you hiding? Were you agonizing over a perfectly crafted response but just gave up? Why are you ignoring me, Mom?!?