Quote Originally Posted by SweetPea
Multiple reasons:

1. After the first fight, Erik said in the postfight that it was a great fight, Barrera was a great fighter, and that he owed Barrera a rematch.
Then Barrera went for his interview and said that Morales was overrated and that he didn't deserve to get the decision, etc. So that started it.

2. Barrera grew up in an upper middle-class suburb of Mexico City, Morales grew up dirt poor in Tijuana. There's a big disconnect in Mexican culture between Mexico City and the rest of the country.
That was just an angle the press used to blow this shit up to make it an even more intense rivalry... it was down tot he fact morales showed barrera rspect but barrera didn't show him the respect he wnated/deserved....