No it's because he's a weak douche.
When Spurrier came from college to the NFL he said, up front, "i'm going to do it my way. I'm not going to be one of these 20 hour a day coaches. I'm going to use my system, coach with my style, and see if it works"
2 years later Spurrier, up front, admitted the NFL wasn't for him. He wasn't willing to put in the hours, the work. Then Spurrier bought out his own contract and THEN interviewed for other jobs.
Saban came in full of bluster about how hard he was going to work, how great it was going to be. Then he failed. He just failed. He couldn't cut it with the big boys. He looked around, saw the other AFC East teams with growing leads or passing the Dolphins by, was flat out-coached by fellow AFC East coaches, wasn't being treated like the deity he felt he deserved to be treated as, and bailed. Like a wuss. And when he bailed he lied about his reason. He didn't man up like Spurrier and just admit the obvious truth, that he couldn't cut it in the NFL (and no shame there, most people can't). He lied, actively shopped for an escape route, and weaseled his way out.
He's a coward. That's why everyone dislikes him.