Size doesn’t matter?

Beer and Wine in Japan Questions …
Teeny, tiny beer glasses … Can someone please tell me the rationale behind this?
The bottles certainly aren’t small…
by the way just so you don’t all jump on me… they do serve beer in bigger
beer glasses/jugs as well … but often this is what you see.
Same with wine.. often same teeny, tiny glasses.. and well when we are
at the topic of WINE… why is red wine served cold in Japan.. I mean really COLD…
Not everywhere but almost everywhere