Dear {colleague or supervisor},
I am so sorry. I really crossed a line {time frame}. It was not my place to {contradict/undermine/upstage/etc.}, you, especially in a situation like that, with {setting} and {people}.
I should have spoken to you privately. Instead, I let my {excitement/temper} get the better of me.
I deeply regret my actions, and even more how they may reflect on you and the entire organization. With your permission, I’d like to attempt to mitigate the damage by {corrective action}.
Please forgive me for my inappropriate behavior. I assure you that it will not happen again.
Sincerely,
{Name}
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Index of letter of apology templates