Communication in internet is often superficial and impersonal. It is the nature of internet which enables broad communication but very shallow emotionally most of the time and this is not easy to change. You may also come across very dishonest people. Be true, be kind, be yourself and you will find people like you who will be good friends. Here in italki most members are kind, honest and seek true communication and knowledge. Acquaintance and communication takes time to establish, it is like investing time and emotion and most young people in internet are already tired of "empty", careless and dishonest communication.

Don't worry! I say to you " Hi! How are you, my friend?" :)))

Probably because they are busy and have a number of other things to do.