It is mean to ignore and exclude people
Henry is at a sales conference for technology companies.
Henry wants to sell some of his products.
Henry works as a team with his sales partner Kelsey, so they can make more sales together.
Henry leaves his sales partner Kelsey behind because he doesn't want competition from her.
Henry and Kelsey together make more sales than either one would have individually.
Kelsey is left on her own and has to make her own sales, and never works with Henry again.