system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why Bashar al-Assad is so universally hated, especially his Arab neighbors?
gpt
To better understand all things in the Middle East a great place to start is to know which countries are ruled by Shia vs Sunni. Sunni (think: many or "manni") are the **vast majority**. Shia is anchored by Iran. Sunni by Saudi Arabia. Both are oil-rich and both consider each other a top rival that practices the "wrong" version of Islam.

Assad is an Alawitte, who is a Shia minority ruling a 74% Sunni majority country. This alone divides him from Jordan, Pre-US Invasion Iraq, Saudi Arabia, Turkey, and of course his own people. 
However he is not alone, as Hezbollah in nearby Lebanon is Shia which is why they are assisting him in fighting. 

Assad was the son of the previous ruler, Hafez Assad, who frankly was a dictator. Assad grew up privileged. Combine that with gassing his own people during the civil war and you can find many reasons why he is not liked.