Yes - Copts are not Arabs. Just like the Irish are not English. Why are you having a problem with this?
This is semantic.
Their culture is basically the same as the rest of Egypt and they speak Arabic. Yes, they have been discriminated against. But, functionally, and perhaps especially in the US, they have to get along with Muslims. I don't see how we can condemn them for that. You want them to isolate themselves from all contact with Muslims?