It is hurtful to not treat everyone kindly.
Will just showed up to a party and doesn't recognize a guy there.
Will has to decide whether to acknowledge the stranger.
Will introduces himself to the guy he didn't recognize at the party.
Will walks right past the guy that he didn't recognize.
The guy is relieved that Will didn't ignore him and feels better.
The guy's feelings are hurt, and he starts to feel like he doesn't belong.