I Hate Being Ignored

I am not married to my cell phone by any means, but I happen to believe that out of respect, if someone takes the time to send you an electronic message, you should at least respond, even if its just to say "im busy at the moment, but I'll get back to you as soon as I can".That at least let's someone know that you care enough to respond back...I'm so done with people not responding back, is that really too much to ask for?