What did Ponyboy do that convinced two bit that Ponyboy would never get tough?

Ponyboy convinced Two-Bit that he would never get tough when he expressed his deep appreciation for the beauty of the world around him, particularly his love for sunsets and literature. His sensitivity and introspective nature stood in stark contrast to the tough persona expected of a Greaser. This emotional depth highlighted Ponyboy's gentleness, making it clear to Two-Bit that he would always retain his softer side, regardless of the harsh realities of their environment.