Answer:
AHH I READ THIS STORY!!
Step-by-step explanation:
Ponyboy threatens the Socs with a broken bottle, because of his hopeless behavior. Ponyboy is still dealing with grief from Johnny's death. He picks up the bottle, because he doesn't want to give up his life to the Socs. He wanted to show them that he wasn't afraid and could fight back. Even though he didn't want to necessary fight, he knew he had to do this for Johnny.