Responses
I don't think the backstory is to give an excuse to his entitlement or for all the shitty things he's done. But to further show how close they are as at least friends, since that part was mostly glossed over to get to the main plot. If you don't care about the backstory then that's fine but it's still a crucial part of the story.

don't care 'bout his shit ass backstory honestly, doesn't explain nor justify his weird ass actions.