system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does the rest of the Middle East hate Israel?
gpt
The two primary reasons are religious differences and the history of how Israel became a (disputed) country. During the time of WW1 and WW2, the areas now known as Israel, Palestine, Lebanon, Jordan, Syria and parts of Egypt were controlled by different powers, starting with the Ottoman Empire (Turkey) and the British. After WW2, artificial borders were drawn up giving Israel an "official" territory. In the following decades, the countries surrounding Israel, at various times, attempted to take over parts of that territory (most notably the 6 Days War in 1967). Those conflicts were largely unsuccessful but had the effect of breeding resentment between Israel and its neighbors. Territorial conflicts with Palestine continue today from the results of the 1967 conflict. Add to that fundamentally opposed religious views and a history of aggressive self-defense (arguably bordering on open aggression) from Israel, plus open extremism from Hamas (terrorist attacks against Israel, etc.), and you get the situation you see today. 
 
*note that the story will vary wildly depending on which side you ask, but this is a fairly neutral overview.