Yohannes Haile

Here's to the crazy ones. The misfits. The rebels. The troublemakers. The round pegs in the square holes. The ones who see things differently. They're not fond of rules. And they have no respect for the status quo. You can quote them, disagree with them, glorify or vilify them. About the only thing you can't do is ignore them. Because they change things. They push the human race forward. And while some may see them as the crazy ones, we see genius. Because the people who are crazy enough to think they can change the world, are the ones who do. — Steve Jobs

Steve Jobs is widely recognized as a visionary leader who revolutionized technology, but his legacy is heavily marked by documented instances of harsh behavior, ethical lapses, and personal cruelty, particularly during the earlier part of his career. 
Here is a breakdown of the "bad things" associated with Steve Jobs regarding Apple, stocks, friends, partners, and family, based on various accounts, biographies, and testimonies.
1. Personal Life and Family
Denial of Paternity (Lisa Brennan-Jobs): When his girlfriend Chrisann Brennan became pregnant in 1978, Jobs denied he was the father, stating in a court document that he was "sterile and infertile." He abandoned them, forcing Brennan to live on welfare while he was a millionaire.
Initial Abandonment: Despite naming an early Apple computer (the "Lisa") after her, he initially refused to support his daughter, Lisa, for years before later making amends.
Emotional Coldness: His daughter described him as a "cold" and often harsh parent who was mean, vindictive, and sometimes subjected her to uncomfortable situations in her teenage years.
Regretful Treatment of Parents: He reportedly did not say goodbye to his adoptive parents when they dropped him off at college because he "didn't want them around". 
2. Friends and Partners
Short-changing Steve Wozniak: While working at Atari, Jobs was offered a bonus by Atari to reduce the number of chips in the game "Breakout." He recruited Wozniak to do the technical work, lied about the size of the bonus, and paid Wozniak only a small fraction of the money.
Denying Stock to Early Employees: Jobs famously refused to give stock options to one of Apple's earliest employees and his friend, Daniel Kottke, even after being asked to share his own options.
Rude and Abusive Behavior: Jobs was known to verbally abuse staff and friends, often shouting at them, telling them their work was "shit," or calling them "dickless assholes".
Abandoning Friends: He has been described as a "Lucasian" leader—meaning if he decided someone was not providing value, he would abandon them or force them out. 
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3. Apple and Business Practices
Backdating Stock Options (2001-2006): Jobs was involved in a scandal where Apple "backdated" stock options to make them more valuable, allowing them to be exercised at a lower price. Jobs reportedly knew of the practice but let other executives take the fall for the resulting legal issues.
Firing Staff in Elevators: It is a well-known story that Jobs would fire employees abruptly during elevator rides, causing a "culture of fear" within Apple.
Ruthless Firing at Pixar: When he had to make cutbacks at Pixar early on, he fired employees without any notice or severance pay, only giving notice after being urged to do so by a fellow employee (and making the notice retroactive).
Antennagate (iPhone 4): When the iPhone 4 had signal issues, he flippantly told a customer to "just avoid holding it that way," which was seen as dismissive of customer concerns.
Ignoring Medical Advice: Upon being diagnosed with pancreatic cancer, Jobs delayed scientifically proven treatment for nine months to try alternative medicine (special diets, herbs), a decision many argue directly led to his premature death. 
4. Management and Corporate Ethos
Opposed Corporate Philanthropy: After returning to Apple in 1997, Jobs stopped all corporate charitable donations, believing they were not the best use of money, even though he was a billionaire.
Totalitarian Control: He maintained a "cult of secrecy" at Apple, creating a toxic culture of surveillance and distrust.
Lack of Appreciation for Others: He was known for taking credit for the work of his employees and not acknowledging their contributions. 
Note: Many accounts also note that Jobs "matured tremendously" later in his life, and that his intense, high-expectancy management style was also what drove Apple to its massive success.