Laika - explain rather than spout? I'll clarify my point to give you some meat.
I live in a part of the UK which has a very high rate of migration. This is a mixture of Poles and Pakistani origin families. This has been ongoing for many years. The Poles generally work hard and integrate well. The older immigrants from the 50s and 60s also integrated well. The latest arrivals seem to stick in their communities, wear their former countries national dress - often most offensively full facial coverings, actively avoid speaking English and exacerbate housing shortages by cramming multiple families in small houses forcing the council to step in. Currently my two youngest children are a white minority in their classes, the teaching staff are slowly being replaced by multi language speakers (which stands to reason) and the school governors are now 50% non-white. A sex grooming gang of paedophilic Asian men made the national news and they used a flat above a shop , in view of my house (~100 metres away.) Most of them got away with it. The story has been published in a book called 'I never gave my consent'. My wife's former employer was told to sell his business to an Asian businessman and then was beaten up and robbed. He sold. The same happened to the local autorepair company - its now Asian owned. My wife gets weekly abuse in her current job - mainly from Asian , male youths (not exclusively but mainly.) The local drug dealers are based around the Asian taxi firm which is just around the corner from my house where they run an illegal repair shop from a private dwelling. Each night Asian youths park up around the house smoking and dealing. The white families are being pushed out of the cheaper housing as the Asian landlords buy up most properties and move in immigrants lowering the land value and running areas down.
So this is what I mean - the incumbent population are being replaced. Some get angry and want to fight. Some protest (though the law firmly favours the minorities - the last protest in the town centre ended up with the lady who was handing out leaflets warning about grooming gangs - who had abused her daughter - being put in the cells overnight.) Some try to be extra friendly and defend the encroaching cultural replacement. Some people try to get political representation (UKIP).My family are looking to move as my daughters are scared to go out on their own(oldest has been flashed and propositioned by the aforementioned car dwellers.) This is what it looks like to have your culture replaced. These are all behaviours that have happened before across the world as incumbent populations try to preserve their way of life in the face of incoming people - its a powder keg.
The real shame is that most of the problems aren't from the very first generation immigrants who generally integrated fairly well and took pride in being British. Its their kids and the latest wave. It also wouldn't be so bad if it was a superior culture but its setting back equal rights and causing massive pent up anger - on both sides.