I would say the answer is because they sometimes fell bad about something and they don't know how to work it out, I am sorry but I don't know much about boxers... ^^
I can help with English since I am in an AP English class and a peer tutor in English but anyways if you can elaborate on this that would be wonderful..
What exactly are you asking?
If you need a fill-in-the-blank answer, 'doesn't' would work okay.
At first the people does not bluntly show gratitude to Jim, they treat what he does as his work which does not need gratitude. Later on, they learned that they must thank him for his work even if he gets paid for doing it. They should still show gratitude to him, this boosts his morale and will make him enjoy his work more.
The three cases of personal pronouns are objective, possessive, and nominative.
I, we, you, he, she, it, they are nominative cases. They are used when a personal pronoun is used as the subject of a verb or as a predicate nominative.
Me, us, you, him, her, hers, its, their, and theirs are objective cases. They are used when the noun or pronoun is used as an direct or indirect object of a verb, or as the object of a preposition.
My, mine, our, ours, your, yours, his, her, hers, its, their, theirs are possessive cases. They are used to show ownership.