Actually there were increased attacks under Morsi, but Mubarak wasn't all that good at protecting the civil rights of Coptics and non-Muslims. But as far as the title of the article goes, "What else is new?"
Silas wrote: Ibn Sa'd's "Tabaqat", gives a clear description of Muhammad having "relations" with at least one of his slave girls. Muhammad had sexual relations with Mariyah, his Coptic slave. Mariyah and her sister, Sirin were slaves given as gifts to Muhammad. Muhammad gave Sirin to Hasan Thabit, the poet. Ibn Sa'd says that Muhammad "liked Mariyah, who was of white complexion, with curly hair and pretty." [Taken from Ibn Sa'd's "Kitab al-Tabaqat al-Kabir" (Book of the Major Classes), p151].
Ibn Sa'd also writes that Mariyah bore Muhammad a son named Ibrahim. He died 18 months later. Sa'd writes: "If he had lived, no maternal uncle of his would have remained in bondage", p164. This shows that there were other Coptic slaves owned by the Muslims.