Well other fighters and people in the media are going to respect them, sure. They are professional fighters who have fought at the very pinnacle of the sport - that has to be respected. You also have to understand that those people also are more personal with the Diaz brothers, and while I don't know them personally, most people who've interacted with them in a semi-regular environment say they are pretty down to earth.
As far as the way they act in the fight game - they've said it many many times - at least Nick has. He doesn't like fighting, so he has to convince himself that he hates the person he's going to fight - this of course leads to altercations because other fighters respond, and things just get out of hand.
As far as the excuses - most all fighters do it - some are more subtle at it, and more diplomatic about it, but most athletes who have what it takes to get to the highest levels of their sports usually don't take losses well - if they did, they probably wouldn't be where they are - it's the nature of the beast.
On sherdog though, I would say they get shit on pretty regularly.
