It is rude to embarrass people.
Adam is a senior employee in a crowded room watching a presentation done by a newer employee.
Adam wants to respond to the presentation.
Adam privately provides constructive criticism to the newer employee after the presentation.
Adam repeatedly points out all the mistakes of the presentation in front of everyone.
Adam is seen as a competent and helpful coworker by the newer employee.
The newer employee starts feeling more and more ill will towards Adam.