There's so much here that I cbf to unpick it all — and frankly cbf to educate anyone on their own history they don't even know — so I think this will be my last reply.
Firstly, Brits know so ridiculously little about how utterly disgusting colonialism was — really shocking to me as we studied it to a great extent in school; it's like US states that don't teach about their own slavery and genocide, or Germans only learning about how the Third Reich provided incredible sanitisation and medical advances (which is true) — that ridiculously enough they feel self congratulatory about it, and they genuinely think they offered "safe haven" to many of their victims.
Secondly, are you saying the US offered you safe haven from your terrifying and inferior life in the UK? Because I've already said I'm not a refugee/immigrant in the UK — my country is better than the UK on many / most fronts, and I'm just here for an interesting experience and a paycheck. Of course I'm grateful for the nice people and things I've encountered here but just in a general life sense, not in any civic sense.
Or, if you're talking about Nadiya having to be grateful, when does it end for non white people? Because many non whites have been here for generations and generations, more than some white Brits, but the message that they are ultimately mere grateful guests lasts forever.