Why is pony embarrassed when dally was talking to the girls in the drive in because?

Ponyboy is embarrassed when Dally talks to the girls at the drive-in because Dally's brash and disrespectful attitude contrasts sharply with Pony's more sensitive nature. He feels uncomfortable with Dally's crude behavior, especially since he wants to impress the girls and make a good impression. Ponyboy is also aware of the differences between their social statuses, which adds to his embarrassment.