Why didn't Dally get angry at Johnny for intervening?

Dally didn't get angry at Johnny for intervening because he understood Johnny's intentions and recognized the deep bond they shared. Johnny was trying to protect Dally and their friends, reflecting his strong moral compass despite being scared. Dally, having a tough exterior but caring for Johnny, likely felt a mix of admiration and understanding for his friend's bravery, knowing that their circumstances often required them to stand up for one another.