Andre Berto is giving Conor McGregor a warning Marsellus Wallace would approve of ... saying after the "crackhead ese" diss Conor put on Nate Diaz ... his Stockton privileges have been revoked.
Stockton is, of course, Nate Diaz's hometown ... and when we got Berto out in L.A. we asked if the (racist?) insult Conor threw out at the UFC 202 presser Wednesday was over the line.
Check out the clip -- Berto says yes ... so much so that he thinks it'd be better if Conor avoided the lovely city of Stockton altogether for a while .