1-2017 When will people learn some decency ?

Why do people not realise that they are being
rude, impolite, and uncivilised, when they do not respond to mails ?
Imagine calling me up on fone and I just keep listening without
answering a word  !  Imagine getting a deafening silence 
everytime you call someone . email is no different. Even if you
do not have a definitive response at hand, and you need time to 
get/give a proper response, it does not hurt to give a provisional 
response/acknowledgment/reaction. Simple logic, which many do not 
seem to know. Just like people who do not know traffic rules, should 
not be driving a car, people who do not know rules of decency, should 
not be using emails.   

I was under the impression that I was surrounded by educated and cultured people. 
I realise I was wrong. Since I do NOT accept such behaviour from people whom I know:

1. You can expect the same behaviour from me, when you try to communicate with me.

2. You can expect some harsher treatment from me.