Why was Two-Bit's trick on Johnny in Chapter 2 especially cruel?

In Chapter 2, Johnny and Ponyboy were sitting with two Soc girls, Cherry and Marcia, while they were watching a movie at the drive-in. All of a sudden, Two-Bit crept up behind them and put his hands on both of their shoulders and said, "Okay, greasers, you've had it!" (Hinton 25). Ponyboy mentions that he nearly jumped out of his skin because he was so scared. Ponyboy then looked at Johnny, whose face was as white as a ghost. Johnny's eyes were closed, and he was also gasping for air. Two-Bit's joke was especially cruel because Johnny had recently been beaten badly by a group of Socs. Johnny's face was nearly unrecognizable after the beating and he had been skittish ever since. Two-Bit acting like he was a Soc who wanted to fight Pony and Johnny brought back Johnny's terrible memory of getting jumped.