After going to this masjid on and off for years and recently going to some of the classes I can tell you, these people talking bad about the sheikh are either Lying or leaving out immense context. With all the salah I prayed behind him, and the hours (if not days) I spent in his classes, I can say this knowing I will be accountable for my words with the one who created me, I have never seen the sheikh get mad or upset except with people who insist on playing with the religion. There are only 3 times that come to mind: 1-the khutba. The sheikh follows the sunnah {Sahih Muslim 867a } and does get angry in the khutba when appropriate. 2- a man kept trying to argue with the sheikh that innovation is good and the prophet was wrong when he said every innovation is evil. The man was bothering other brothers while the sheikh was keeping his cool, eventually the sheikh, without screaming or raising his voice or getting physical, told the man to leave in a upset tone and left him. 3- a person was kissing the Quran for barakah and the sheikh told him there’s no daleel for this and every innovation is evil. The man waffles and keeps arguing when the sheikh gets annoyed with him. He still did not tell, scream, or do what some people claim he does.
Regarding being extreme or arrogant, I gotta ask, how? If you ask him for evidence he’ll give it to you. I’ve seen it personally that if you correct him, he will talk to you to learn a bit more and them check it again. If he was wrong, he has no problem saying that. If these people complaining about him were to sit with him they would see this too. Yes the sheikh tells the people to keep the pants above the ankle but so did the prophet of Allah صلى الله عليه وسلم {Sunan an-Nasa'i, 5332}.
Tldr: Don’t believe the people who speak ill of the sheikh, come to the class and see how he acts yourself. If you believe he’s extreme or wrong, talk to him about his evidences and bring your own!!