Texting (4/27)

So what are the expectations when you are texting someone. For some odd reason every time I text girls or most girls, if I do not respond to them within 5 minutes, I am apparently being rude and ignoring them. I mean come on... I have stuff to do instead of sit around my phone waiting for it to light up and quickly responding. Then the girl gets frustrated and annoyed and I am stuck dealing with her upset. Not cool, totally not cool.