The dementia has several forms
One form has the person turning vindictive and lashing out irrationallly by cussing out someone or by say writing long terrible letters. The irrationality feeds on its self and they make stuff up to feed their arguments.
That would be bad at say the G& meeting
Hume: “That’s the kind of memory problems that people his age and indeed my age have all the time.” -— By the way, that was a pretty kind way of Brit to tell the truth.