Answer: It's not that Hitler had simply hated the Jewish people. In fact, the Jewish people In Europe were victims in the Middle Ages of Discrimination and Persecution, as you may know, they went through ALOT. Bad things had happened to them. And mainly they suffered from discrimination and persecution because of religious reasons. Christians saw the faith of Jewish people as "weak"? And even some of the times they weren't allowed to practice certain professions. They were like restricted sad people. They also experienced traumatizing things, for example, Hitler was known for his disgusting hatred for Jewish so in the First World War he caused a trauma poison attack and just other horrible things he'd do to the Jewish people. It's really just too sad to talk about. but yeah, they suffer for many many centuries persecution and discrimination.
Hope this helps! Couldn't write a whole essay regarding this topic because it's too much to explain but hope it helps you. Goodluck! :)