Logan is mad at Kendall for a variety of reasons. The main reason is that Kendall has led not one but two unsuccessful coups against his father. The first coup was in season 1, when Kendall attempted to take control of the family business from his father. This coup failed, and Logan was not pleased. The second coup was in season 2, when Kendall tried to take control of the family business from his father once again. This coup also failed, and Logan was even more displeased.
At the time of Logan’s passing, Kendall was in the process of undertaking a third coup against his father. This was the final straw for Logan, and he had all but cut Kendall out of his life. Logan had made it clear that he would never forgive Kendall for his actions, and he was determined to make sure that Kendall would never be able to take control of the family business.
In addition to the failed coups, Logan was also angry at Kendall for his reckless behavior. Kendall had been involved in a number of dangerous activities, including drug use and gambling. Logan had warned Kendall multiple times to stop these activities, but Kendall had not listened. This only further angered Logan, and he had all but given up on his son.
Finally, Logan was angry at Kendall for his involvement in the season 2 finale. In the finale, Logan had planned to send his own flesh and blood to prison. This was the final straw for Logan, and he had all but cut Kendall out of his life.
Overall, Logan was mad at Kendall for a variety of reasons. The main reason was that Kendall had led not one but two unsuccessful coups against his father. In addition, Logan was angry at Kendall for his reckless behavior and his involvement in the season 2 finale. Logan had all but cut Kendall out of his life, and he had made it clear that he would never forgive Kendall for his actions.