Do you call cups "glasses" even if they are not made of glass?
No... if it's a cup, I call it a cup. If it's made of glass, I call it a glass. Except for the one glass thing with a handle that's built like a coffee cup. That one I call... a cup.
Only in the situation that I am saying "I am having a glass of water". But most of my cups are made of glass anyway.
If my cup is glass, I call it a glass. If my cup is plastic, I call it a plastic.
Is the plastic half full, or half empty?
All of mine our made if glass so....
Me too. No confusion in what I am saying.
I only call it a cup if it has a handle.
No I call cups cups and glasses glasses.