Didnt look bitter to me, more the case that he a very modest bloke and he probably feels bad letting down lots of Englishmen that have followed him 5,000 miles away from home and given that level of support, when he has no reason to.
saying he had no chance is a bit harsh, he was always in with a shout but we all knew he'd have to box out of his skin to stand any chance.
Mayweather is just an act, all this bravado and "bad guy" bollocks is just to get in the money and we all know he's just in it for the money, afterall he is into the promotion side now and this is where he wants to make his money, having a big mouthed cocky cunt making big claims always draws in the crowds because people want to see him get beat. big mouth = big crowds, big crowds = big $$$$