Floyd Mayweather Sr. is coming out swingin' at Justin Bieber -- saying the pop star doesn't know a DAMN THING about boxing if he thinks Conor's gonna go the distance. Remember, Bieber -- Floyd Jr.'s longtime friend -- recently shot down the idea…
TMZ Staff, TMZ
Thu, 08/17/2017 - 7:31am
Floyd Mayweather Sr. is coming out swingin' at Justin Bieber -- saying the pop star doesn't know a DAMN THING about boxing if he thinks Conor's gonna go the distance. Remember, Bieber -- Floyd Jr.'s longtime friend -- recently shot down the idea…