If someone sends you a message, will you reply? If they start with something specific, I will respond. But if their first sentence is "Are you there?", I won't reply, and I might even wonder why they're looking for me. In situations like this, I just know that good things don't usually happen to me, so I generally don't reply. It's not indifference; it's clarity. It's not rudeness; it's avoiding being drained.