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Max literally said in season 2 that billys “always been a dick but now he’s just angry” which implies that before Hawkins/whatever incident led to Hawkins, billy was just like annoying at best. Which is a typical emotion one feels for their sibling. So clearly shit wasn’t always dire. But now everyone wants to act like billy came out the womb a devil child like get the fuck out of here
ALSO I am thinking about how Sadie said she thought it was weird max was singing and laughing with her friends after her brother just died