Conor McGregor told Floyd Mayweather he can take that olive branch he offered and shove it ... saying, "There is no peace here kid."
Remember ... Floyd gushed over McGregor to TMZ Sports on Monday, calling the Irish fighter a "warrior" and even inviting him to train for the Khabib fight at the Mayweather Boxing Club in Vegas.
But Conor clearly wants no part of that ... declining Floyd's offer on Tuesday with a fat middle finger.
"F*ck the Mayweathers except Senior and Roger," Conor said.
"There is no peace here kid.