I think red and black because they represent unlucky days.
If the bold sentence is in fact As he tells the story he never smiles, and he never frowns",then it is most likely the human foible due to it being an interesting characteristic. We can also determine this answer through process of elimination if we know the meaning of hyperbole, and "funny name".
Hyperbole is an exaggeration and is not normally meant to be serious, and in the case of your summary, I believe this line is meant to be taken serious. This doesn't seem to be a funny name reference, so your only option is human foible.
Interpersonal skills are close to emotional intelligence. You need to understand other people, their motivations, and their state. You need to know timing, because if you ask people something on the wrong time, the answer will always be no. You have to self control and understand that what matters to you, it does not have to matter for another person. Everyone is different and you have to respect that if you want to be respected.
