A couple of things:
1. Larry was clearly trying to show off in front of his boys.
Notice how he didn't run up on Roger and his crew (who started the whole thing).
He knew that they would have left him leaking without fail.
That is why he purposely ran up on Doug. Everyone knows that Doug wasn't going around starting shyt and looking for problems, so Larry thought he found an easy mark to make himself look good on.
2. He immediately knew that he fukked up after he stole off on Doug.
Peep his
reaction afterwards.
3. Doug should have beat down his bytch-ass A/V Club homeboys as well
, especially after that little "smear campaign" they tried to run on him throughout the school.