IIRC, and I might not, this same source claimed that the reason he was scandalized was because no one at the dance talked to him/tried to interact with him. He was just invited as some trophy in other words.
Anyway very interesting if true. Im not sure this even fits in your timeline (I think the MB was founded earlier in the last century). But if true an interesting glimpse into how such radicalization such hatred starts. From some of the smallest things, things we may consider even trivial. Kind of puts even more importance on acting like a Christian every day, with whoever you meet.
However, I would add that the psychological makeup of most Muslims is complex and almost defies western analysis. They cannot be fixed, adjusted, moderated, reformed, etc. by any method. They are, as they are, simply unfit for the modern world and shackled by a medieval ideology. To understand them, or at least to try to understand them is interesting. To think we can change them is absurd.
And some of this in the Middle East as in Libya seems driven by Tribalism from what I can tell. Crazy world.