I always find a way to know the cup size of girls I play with online to determine if they're good for a relationship or not
How did you find that out?
I slap the holy hell out of their girls with my big hands.
You're objectifying this woman and that's very wrong. What would you feel if someone where to judge you on something related to your body?
I don't care, if she doesn't have a big enough breast then she's not good for a long term relationship.
That is so wrong to objectify people like that. You should not judge them based on the size of their breasts. That does not determine their worth.