Starbuck is an awful person
The way she treats Anders - who never actually did anything to her - is inexcusable. She's all about him when they meet, begs the fleet to go back and rescue peope, and then just outright hates and abuses him. Only wants him around if he'll sleep with her and is an awful wife/partner.
But right now, I'm watching the arc where Gaeta slowly descends into madness. It's right before the mutiny. He approaches her and gives her some shit over her husband being a cylon AND the fact she almost killed him in the tribunal. Does she apologize, or at the very least sit there and take it - because DOES deserve it - no. She mocks him being a cripple, which is courtesy of Sam's actions. I can't find a clip of this specific exchange, but it's not the first time she went after him: https://www.youtube.com/watch?v=RU-YqkgTtZw. She's a complete and total asshole.