According to Mayweather, all of that gives a man with zero boxing matches on his resume the edge over the best boxer of his generation.
"I just didn't like when he called us monkeys", Mayweather told Smith in a sit-down interview, which aired on ESPN's First Take this morning.
"He's a lot younger. He's a lot younger, so youth is on his side", Mayweather said of the 29-year-old McGregor. I've been off a couple of years, and I'm in my 40s.
But come on, Floyd, enough with the sad-sack routine. What can fans expect from this fight in comparison to the fight with Manny Pacquiao two years ago? Because I owe the public for the Pacquiao fight. "I lost a step", Mayweather said.
"If he goes 12 rounds and loses every round with Floyd Mayweather, that is quite an accomplishment and pretty wonderful to me".
"A fighter like Andre Berto isn't even supposed to go the distance with Floyd Mayweather, but remember, I was 38".
"I'm not what I used to be".
This is all very peculiar behavior from a man who has never been known for his modesty.
McGregor packs quite a punch, so Mayweather certainly will need to be on his toes despite his opponent's inexperience inside the squared circle.
The reigning UFC lightweight champion courted more controversy after the tour's Toronto stop during a backstage interview with Jimmy Kimmel Live, in which he was asked who would win a fight between himself and Rocky Balboa from Rocky 3.
"I used to have a 90 percent knockout ratio".
It's possible we're seeing a new Mayweather - aware of his vulnerability as he confronts middle age, and cognizant of the steep toll time takes on every fighter's skills.
"This can't be a defensive fight". I gotta go to him.
There were hints of the famous brashness though, when he said: "I didn't say I couldn't fight. They going to be pleased with this fight right here".