Because in FLoyd's mind... Gatti was the greatest ever and beating him was like beating Duran or Hearns. L O L
He was under the impression that he just beat a prime elite fighter for the first time in his career.
How many guys get to have that type of performance with everyone watching? He will always be remembered for that fight. I think it was this fight that made Floyd a PPV star. Everyone wanted to see if he could do the same thing to De lahoya.
And he couldn't. The same douche bags impressed by his win over a war torn Gatti are the same special needs children who think Pacquiao/Bradley was close.
He had just destroyed one of the most popular fighters of the era, doing exactly what he said he would do: humiliate Gatti.
Alot of boxers cry after winning fights, some cry after losing as well. Why does it matter as long as the fight was good.