You don't go up to a fat friend and say
Omigod you're so fat! Magpapayat ka nga!
So you can't come up to me and say
Omigod ang payat payat mo! Magpataba ka nga!
even if it is in a joking manner.
It's offensive. It's hurtful. It's accusatory without needing to be.
*I speak for all the girls out there who can't help but
be skinny.