I've forgotten about conditionals for a long time as I thought I learned almost everything about it from 5j here. But sometimes like in the following example - I don't clearly remember what they were - teachers comment like "If you said".
So when teachers say "If you said", do they say considering that it's contrary to what I said "It would be good" or do they just say it's something that wouldn't happen in the present?

A: Let's go to the movies
B: It would be good. -(This is what I said)

A teacher's comment: If you said "I'm sorry, I'm busy", she will think...