Why is Richard pelted with a whiskey bottle?

In the novel "The Catcher in the Rye" by J.D. Salinger, Richard is pelted with a whiskey bottle during a confrontation at a bar. This incident reflects the tension and hostility that often surrounds him, illustrating his feelings of alienation and the aggressive behavior he encounters in social situations. The bottle serves as a metaphor for the chaos and rejection he experiences in his relationships with others.