If you are overly formal in a situation that calls for informality, it doesn’t matter since the readers can still understand your meaning.
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Tone is the readers' emotion that’s behind a piece of writing, such as humorous or sad.
Both “confident” and “egotistical” have positive connotations.
A word can have different connotations in different contexts.
It is proper to say “These are the data I want to show you guys.” to your bosses in the business meeting.