"For every coulda, shoulda, woulda-been-a contender, for every golden gloves champion, every golden gloves loser, for your uncle, for your father, for every rope you skipped and heavy bag you punched -- kick this guy's ass!"
Rapaport's beef with Logan is simple ... he believes the guy is disrespecting the sport by not taking it seriously, yet he's still headlining cards and getting massive paydays.
Michael wants Floyd to put a hurting on Logan BADLY ... saying he believes that'll end the streak of YouTubers thinking they're real fighters.
"It is such a disrespect to the sport of boxing," Rapaport says .