50 Cent is telling friends ... there's a reason he was laughing his ass off at Ray J and Fabolous -- their little Twitter feud was like a fight between two school girls.
We posted video of the Vegas "brawl," which shows Fiddy standing in the background grinning as Ray J and Fabolous went at it.
Sources close to Fiddy tell TMZ, contrary to what some witnesses are saying, the rapper didn't egg Ray J and Fabolous on. He just couldn't believe they were seriously arguing over Twitter.
Days after the fight, Ray J was still taking himself way too seriously in Vegas -- telling us, "I'm not that proud of nothing that happened."
Fact is ... rapper feuds over Twitter kinda ruins the whole street cred thing.
So we ask ...
The Fabolous Fight Was
9/21/2011 9:48 AM PDT BY TMZ STAFF
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