What psychology is it for a person to talk about a little thing?

More fragile and extroverted loneliness.

Through such public conversation, the parties have alleviated some bad or other emotions of the parties to some extent. Then slowly transfer this bad factor by replying to the other party. Then let yourself get more attention, and also get an illusory and real sense of surrounding reliability.

The above answer is a summary of personal experience, please adopt it carefully.