He cheated on his wife with two different women when she was diagnosed with cancer because she didn't want to sleep with him. He admitted to doing so in his book and blamed her because, in his words "she wouldn't put out".
He treats his fans like crap. He turned an overweight kid down when he asked him for an autograph. When the kid pleaded, he said "Go away fat ***". Another fan asked him to sign a poster for his younger brother and he said "No, **** off" before ripping it.
This is from Wikipedia:
In his recent Twitter war against Alberto Del Rio, he verbally buried the entire roster by referring to them as C level stars. He thinks he's in the same league as Stone Cold Steve Austin and The Rock, which I find hilarious. He botched a lot and nearly gave Edge a concussion in one of his matches when Edge was going to hit him with a Spear. He was horrible in the ring and on the mic for the most part of his career, so I assume it was backstage politics and him being roided up that helped him become successful. Vince wasn't pleased when Batista wore skinny jeans on Raw because it made him look small and the appeal in Batista had always been his size. That explains what they saw in him before handing him all the titles he had won.
Haha "get away fatass!" Wow Batista sounds like an awesome guy if you ask me. Just kidding what a douche. Yeah I knew about the Booker T fight. Truthfully I don't really care if someone is arrogant unless they actually start doing crappy things to people. Also I wouldn't take his tweets to another wrestler too seriously. Especially when they were clearly just for the purpose of hyping up their confrontation on Raw.
Regarding his treatment of the fans was he a heel at the time? I know some wrestlers even to this day will act like a heel towards fans in their day to day lives if they are playing a bad guy on TV.
I'm not necessarily justifying his behavior but I know Chris Jericho wouldn't even acknowledge fans on his way to and out of the arena during his last stint as a heel a few years ago. He said so himself in an interview so I'm not just making that up.
Now cheating is a ****** thing to do of course. The fact Batista's wife had cancer obviously makes it infinitely worse. But did he really just say he cheated because "she wouldn't put out", or was there more to it? I can't imagine why anyone would say that unless they were trying to be known as the biggest scumbag in the world. Surely he must have explained himself better than that. Why would anyone bring that up in their autobiography unless they were being very apologetic about it? I haven't read his book but surely he wasn't such an insensitive prick when telling that story. I mean the act of cheating itself is bad enough. I do think spouses at some point are obliged to fulfill each other's sexual needs, perhaps obliged isn't the best word to use but you get my point, not that I condone cheating. Still you'd think Batista would be a bit more patient and understanding in her time of need, or maybe he was and there is more to it that he did or didn't mention in his book.
I'm just playing devil's advocate here seeming as I haven't read his book or know any of the details.