Now for a half-gone, half-replenished edition of…
SHUT THE HELL UP!!!!
No, you can NOT tell whether someone is an optimist or a pessimist or anything like that merely because of whether they say “half full” or “half empty”. I know, I know, you want to look all smart and insightful, to make whomever you’re saying this to start to see you as wise or some shit. I don’t know.
In any case, cut the crap. It means nothing. You sound stupid saying it. It’s mind-numblingly cliché.