Argentina - Reactions to World Cup game loss

The video begins with a greeting and a mention of a problem, followed by a correction. It then shifts to a discussion about new developments, including a mention of a new person, and concludes with a casual affirmation.

How does the phrase 'Doesn't matter. Mania' reflect the speaker's attitude?

What does the response 'I'm good.' imply about the speaker's state of mind?