Shots fired from boxing legend Bernard Hopkins -- who's dissing McGregor vs. Mayweather in a BIG way ... saying the whole thing is a "fake news" fight.
FYI, B-Hop works for Golden Boy Promotions and is hyping the other superfight of the year -- Canelo vs. GGG ... a fight Hopkins says is undoubtedly the superior event.
In fact, he has a message to people leaning toward buying the MayMac PPV over the Canelo fight.
"You got a chance to get in a Ferrari but you choose the Pontiac?!?"
Yeah ... he's not holding back. In fact, he won't even say Conor's full name.
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