Do you like being hassled by others?
Person X: Hey, whats up? <--- Seen by Person Y
Person X: Hey, you didn't reply, whats up? <--- Seen by Person Y
Person X: What the hell, reply! Whats up? <--- Seen by Person Y
Person Y: WHAT!?
Some of us like our privacy and distance from others.
Some of you all seem to need more mature friends if they'll harass you over not instantly replying to a message.