I believe this to be true.
I know several people who are sarcastic and say ‘just kidding’ but I think they are really saying what they really believe to be true (as an aside I really dislike sarcasm.)
Every ‘I don’t know’ and ‘I don’t care’ (and I find that I do this more often than I would like) really has an answer or a feeling behind them.
And ‘It’s okay’ does have pain behind it. I recently had to put down my dog and when people asked me how I was doing I would say I was okay. And in most ways I was okay except I hurt and was sad for the loss of this beloved family member.
So the next time you hear someone say, ‘just kidding’, ‘I don’t know’, ‘I don’t care’ or ‘It’s okay’ think about what they are really saying to you.