Conor McGregor is still FUMING at Floyd Mayweather for dragging him into a conversation about racism -- saying, "There's people buried in the desert for less than that."

Of course, Mayweather made headlines earlier this month for using McGregor to make a point about racism in combat sports.

"They say [McGregor] talks a lot of trash and people praise him for it, but when I did it, they say I'm cocky and arrogant ... so biased! Like I said before, all I'm saying is this, I ain't racist at all, but I'm telling you racism still exists."