Demanding that Muslims denounce various extreme forms of Islam is dumb. I know it's common among the racist community to demand this, and they seem to think it makes perfect sense. But just think about it. When was the last time you publicly denounced KKK, the Nazis, the Crusades, Jehovas Witnesses, the inquisition, Joseph Kony and so on.
While Muslims have a Muslim identity, they don't represent anybody but themselves. They have no reason to denounce any Muslim they disagree with. They might do it anyway. But to demand they do it on cue is rediculous. He refused to play those journalists game, and he did the exact right thing IMHO.
How about starting with the assumption that a random Muslim will very likely disaprove of any strain of extremism, from any side and in any way? Then ask yourself, do I think that there's a small sliver of a chance that he supports Hamas and Hezbollah? Since, that's a no. Then why bother demanding that he denounce them? If you think he does anyway, I'd call you delusional.
On that topic, mosques and various Islamic advocacy groups around the world regularly go out and denounce terrorism. All the major ones condemn every single one, each time any act of violence is committed in the name of Allah. Just to shut up people like you. That doesn't prevent this rediculous demand to keep cropping up.
https://www.theguardian.com/world/shortcuts/2017/mar/26/muslims-condemn-terrorism-stats
How about thinking before you type next time? Is that too much to ask?