Rafael Limon had some really nasty trash talking moments. Before the Chacon IV fight he taunted Bobby about the fact that Bobby's wife Valerie had shot herself and that she was in hell, which was where Limon was going to take him.
Indeed he did, when his fists weren't as able to do the talking he took to verbal. Tyson was earning mega bucks even when his career was in decline, making outrageous statements earned him plenty.
......then Eubank cracked him with an uppercut. Eubank I believe was distraught about the outcome and all the talk means nothing except a way to sell the fight, WWE style.
It was very real. Talk like that is personal and sick and hate-filled, if anything it'd stop people buying tickets.