Charlie Sheen says John Mayer's lawsuit against famed watch broker Bob Maron has nothing to do with fake Rolexes ... it's all retribution because Charlie bumped John off the cover of "Rolling Stone."
Charlie called in to "TMZ Live" and told us Mayer is using the watch thing to mask his bitter feelings toward Bob ... who convinced "Rolling Stone" Charlie was a more worthy cover than John.
Charlie says it's all petty celebrity jealousy.
You gotta watch the video ... Charlie holds back, then explodes on John.
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