What deos it mean to you that Ponyboy stopped to pick up the glass he broke?

Ponyboy was trying to act tough by breaking the top off the bottle and using it threateningly. Ironically, when everything was over, the the other boys went away he picked up the glass. Tough guys (bad boys), don't pick up glass....... and they don't worry about anyone getting a flat tire. This is just another glimpse into Ponyboy's character; he's a good kid.