Why does my great granddad keep butting in on my blackpills i tell him with war stories

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Its so annoying we get it you fought in the battle of Britain and you shot down 6 german planes and you stopped nazi invasion of Britain. Let me talk about how women only want chad and how I need leg lengthening to be considered human. He keeps Interrupting me every time he does I hit him to try and condition him but he's pretending to have dementia so he "forgets". FML