Scenes on board NZ plane as it takes off to search for debris in ocean

The video contains a brief statement that may be perceived as offensive or derogatory.

What are some possible reasons someone might say 'You're dumb'?

How can insults like 'You're dumb' affect a person's self-esteem?

In what situations might someone use the phrase 'You're dumb'?

What are some constructive ways to respond to insults like 'You're dumb'?

How can we promote kindness and discourage insults in our communication?