Well Israel is a settler-colonial project propped up by a global military empire who wants a military ally/outpost in the middle east, and that settler-colonial project is ripping people out of their homes to give land to settlers.

Palestinians are the ones getting ripped out of their homes, having legal rights stripped away from them, and ultimately being corralled into what are fenced-in, open air concentration camps as Israel continues expanding its borders. This is what has resulted in conditions like what we see in Gaza, which is currently one of the highest population density places on earth as a result of Palestinians having more and more of their land colonized and the families who weren't murdered in ethnic cleansing campaigns had to live closer and closer together as they were driven out of their homes. And as more and more people keep getting shoved into smaller and areas of land as Israel closes its borders in more and more via military occupation, Israel uses its control of the land surrounding these settlements to restrict food, medicine, and electricity from getting to Palestinians. Gaza usually only gets 4 hours of electricity every day despite living in an arid climate where not having air conditioning can result in death from heat stroke on particularly hot days. ~95% of the water in Gaza is not safe to drink, so death from starvation and dehydration are both incredibly common. And with extremely limited access to medical resources, very few people live to/past middle age, with the average age in Gaza currently sitting around 19 years old. Living conditions are so bad that suicidality among children is incredibly common, with over half of people under 18 reporting that they have no will to live when surveyed. And when Israel is not expanding its borders and settling more land, it preys on the desperation of the Palestinian people who have had their lives ripped away from them by employing them for cheap labor to make the lives of the settlers more comfortable. Those are the Palestinians who also have citizenship in Israel so that they can work in Israel, but even with citizenship they are second-class citizens without access to most political and legal rights.

Israelis don't have any particular reason to hate Palestinians, they're just doing what every settler-colony does and they keep experiencing blowback from the people they are colonizing. All of the propaganda about thousands of years of Holy War over a Holy Land is just a founding mythos used to obscure this colonizer/colonized relationship by pretending that these are two groups on equal standing that are bickering with each other because they just can't get along.