Well, I don't think so. There are many different people in Korea, as in USA. You should not have a prejudice. I think it was just a process of trial and error -- Just, you have not met a good Korean friend yet. Please, don't be disappointed with that.
I think a good friend feels responsibility toward you, and really cares about you.
If you need any help for learing Korean, I am willing to help you, as always.