Floyd Mayweather is being called out for being TOO FLASHY ... but the hilarious part -- the guy calling him out was driving a Rolls Royce at the time.
2-time welterweight champ Andre Berto was cruisin' around L.A. this weekend when we brought up Mayweather -- who's selling his ultra-rare Ferrari Enzo for $3.8 MILLION.
"He got too many of 'em anyway," Berto said ... noting that he doesn't need to resort to that "extra s**t" that Floyd does to get attention.
... while sitting in the driver's seat of his $300k Rolls Royce.
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