Cinss, Clomid is generally used by women with annovoluatory or irregular cycles. The doctor your friend saw is right, OPKs only indicate if you are having a surge not whether the surge will actually cause ovulation. I think the majority of people that get a LH surge will ovulate though so I don't know why the doctor would make your friend feel silly for using them.
I used to get a lot of false positive OPKs on Clomid as well so if you don't have monitoring when you take Clomid it can sometimes be hard to predict what CD O will be on.

