I can only give my personal experience but, when I lived in big cities with a large, multicultural population, people of all ethnicities and beliefs seemed to be more integrated. The cities were too much of a melting pot for there to be much ghettoisation. And areseholes were arseholes, regardless of religion.
When I moved to West Yorkshire, I used to very patronisingly spout that problems with radical Islam, and support for ISIS, were not a huge problem, it was a minority of men, and I engaged in similar whattaboutary to many posters here. Then I was forced to wake up.
I nursed in a very large area, where there was supposedly a culture among young Islamic men, whose family originated from the Pakistani and ME areas, of going to Pakistan to ISIS training camps. I dismissed this as racist bollocks. Then I had it confirmed first hand by the Counter Terrorist Unit, having had the misfortune to have to report a patient, who gleefully showed me pictures of his son, who he had taken to the Pakistani mountains, dressed in the white bandana with red writing of the Islamist martyr. Posing with a Kalashnikov. At the age of four.
This man, and the other young, male Muslim patients, whose family originated in those areas, were otherwise actually otherwise really nice. If he had not shown me what he did, I would have had no idea as to his, and the other men's true feelings. They seemed like any other young Westernised men, however when young, male Muslim patients, from Pakistan or the ME were in common Ward areas, they all cheered ISIS and the 7/7 bombings, and left me in no doubt that they believed that white, non-Islamic people, were the infidel. I was apparently a second a second class citizen because I am female (though they rarely made this known to my face).
The CTU already had this chap on their watch list. They confirmed this trend in the area for going to ISIS training camps and coming back. They didn't arrest everyone who had been, as the small-fry at the bottom could lead them to the main instigators. Unfortunately, this meant that inevitably some slipped through.
There is a very real issue with radical Islamic sympathies in parts of this country. Particularly outside of large cities. To minimise the existence of these issues with whataboutary, is to undermine both our own security services intelligence, and their need for ongoing funds. It also allows the issues to escalate, within plain sight, and with no comeback. As people become afraid of discussing or reporting without being called a racist and illiberal.
As for what we do, I can only think of joining StoptheHate, reporting odd behaviour, and supporting our security services who work damn hard. I also think that accepting that such values and ISIS sympathies exist, is the first step in addressing why they exist here, and how to change them.