I had to look up what 8 fl oz is in a sane unit(236ml), and that seems perfectly normal to me - pretty much all glasses that you can buy here are 250ml. If you buy a 330ml can of coke you can usually pour most of it in with some left for a top-up.
I wouldn't call anyone a 'psycho' for not adhering, but personally I'd typically pour a pint (568ml) of water, at home.
Of course, at any restaurant glasses given with water for the table are going to be somewhere much nearer your 236ml, so there's really nothing psychotic about it.
> Of course, at any restaurant glasses given with water for the table are going to be somewhere much nearer your 236ml, so there's really nothing psychotic about it.
Bingo. It's not hard to sip on a average sized glass of water during a meal. I routinely kill a 750ml water bottle at the gym or when hiking.