Trend that I hate

The trend I hate the most is when people on text or Snapchat leave you on open. It takes .2 seconds to respond then to just ignore it. It is okay if you have an actual response like your phone is dead or you were sleeping. But when you are on your phone and I know it, it is very rude and disrespectful to the person you are trying to talk to. When people do not respond then I get kind of upset because it is not that hard to just text back or Snapchat back. It is something I hate.