According to the Al Aqsa Foundation, he and 13 "settlers" actually went up to the Dome of the Rock, which seems highly unlikely (we've seen Moshe Feiglin do this but the vast majority of religious Jews would not go there because of its extreme sanctity.)
His presence caused the Muslims there to supposedly force him and the other Jews out of the complex. They claim he was insulting them (which, in their minds, he probably was - by standing there.)
The Al Aqsa Foundation issued a press release criticizing Glick, and this got picked up by Al Azhar University - the most prestigious Sunni institute of Koran study. Al Azhar issued its own statement:
Al-Azhar strongly denounced here today Jewish Rabbi Yehuda Glick's breaking into Al-Aqsa Mosque through the Mughrabi Gate and ascension to the perimeter of the dish of the Dome of the Rock, accompanied by a group of Jewish settlers and guarded by special units of the Israeli police.This is the first tme I've seen Al Azhar join this particular bandwagon of antisemitic hysteria.
Al-Azhar's Sharif warned in a statement of the severe consequences of the recurrence of such aggressive acts that contribute to the breach of security and peace in occupied Palestine and hamper efforts dedicated to a just peace.
The statement called on the Organization of Islamic Cooperation and the Arab League and the international community to take a firm stand against these provocative practices and prevent their recurrence in the future.