Hereditary really scared me

I watched hereditary again but this time I googled every clue and every scene to know what is the story behind it, one explanation of a scene I didn't pay attention to was the dinner when they were at the table and she told her son I hate when you do that face that you do, I didn't think much about it then but after researching I learned that it was about the demon bamon possessing the boy's body and doing that face to his mother to make her angry and lose her mind, specially after he killed her daughter so he can take over the whole house, this really scared me I was able to say that demon name for a while now in case he was real!