My time has come! Ruuuuuuuuuuuuuule Britanniaaaaaaaaaa! Britannia rules the waaaaaaaves, Britons never, never, never, will be slaaaaaaaaaves!
Unless, of course, it's to US tech-bro billionaires, Russian oligarchs, Eton hedge-fund fuckbois, Australian media deathlords, or a range of other vastly wealthy skidmarks.
Maybe you miss their point, perhaps because they didn't use a /s or something.
In the mind of the racist dingleberries there are white immigrants (including but not limited to Celts, Romans, Normans, Saxons, Vikings) who are 'real Britons' and then there are brown immigrants who are clearly not 'real Britons', on account of how they don't look like us but do like spicy food.