I'll start "60 of Julio Ceser Chavez boxing opponents were Tijuana Cab Drivers that my mom could beat up"
Billy Joe Saunders in his lost to Canelo not only because of his trash talking to Canelo but his comments regarding Daniel Dubois' loss to Joyce. "I'm going into this fight for the sole purpose of proving that a white man is better than a negro" - James Jeffries before the Jack Johnson fight. Rod Salka wearing brick wall patterned trunks with the phrase "America First" on them in his fight with Francisco Vargas. David Haye wearing a t-shirt of him decapitating the Klitschko brothers before losing to Wladimir.
Prince Naseem Hamed before and, amazingly, even after his bout with Marco Antonio Barrera. He even got his comeuppance on his ring entrance when a fan in the crowd flung his beer at him ruining his magic carpet ride into the ring.
If I remember correctly in the fight where Max Baer killed someone there was a lot of trash talking going on with the opponents friends corner or family. Can’t remember been awhile since I read his biography
Nate Campbell trash talking Robbie Peden during their first fight then giving Peden a free shot. Campbell was KO'ed.
"I can beat Oleksandr Usyk after drinking 15 pints. What's he gonna do, jib and jab me around?" - Tyson Fury.
James Jeffries had a few lines worth remembering before being completely dismembered by Jack Johnson... "I am going into this fight for the sole purpose of proving that a white man is better than a Negro."