I highly doubt that this is purely an INFJ thing ...because literally everyone does this to me. And I am not lying. Every single person (besides my immediate family ...and I am more likely to ignore my family vice versa) does this, so they cannot all be INFJs. It doesn't matter what I say. I text something as simple as "where did you buy your computer" .....and they will take two days to respond ...even when it's on facebook and you know they have seen the freakishly simple message. And when people do respond to my messages, it is short one word responses, so why did it take THAT long to say "best buy"
So the highly convoluted explanations that you INFJs and other people are posting here never makes any sense to me. I don't see how it REQUIRES more than two weeks to tell me "No, I cannot come over today. Next time (or maybe what they wanted to say was ...I hate you stop talking to me ...in that case, I can understand why you wouldn't want to respond at all)." Like I am not lying, this girl literally took more than two weeks to tell me she could not come over. I have a friend who takes much longer (like, a month and more) to respond to any messages. Doesn't matter how simple.
I only know of one person who responds within 10 minutes, but she hates me now, so no more responses (and if she does, it is very ...polite...) I have another friend who responds within 5-8 hours.
I am getting tired of it because it is this happens too often and by too many people for me to say "hey maybe this person is just having a bad day" So I will: 1.) be more responsive to people myself 2.) Stop wanting to interact with unresponsive people. And so far it is sort of working but only a little; however, I have made plans to visit a friend on New Year's (....and I never make plans with people EVER ......so yay me!)
...I would get extremely frustrated and just say that people just don't have any time for me, but maybe it's actually because I don't really invest time and genuine interest/care in others because I think any interest someone has in me is fake/polite. That, and MOST people are extremely boring. In my case, the lack of people who care to respond to me is mostly my fault.