I don't believe it

It's difficult to imagine words to more perfectly illustrate the total moral and intellectual bakruptcy of the 'anti-racist' Left than these:

The Ukip leader was left stranded in the middle of Edinburgh’s Royal Mile, surrounded by around 50 nationalists and socialists calling him a racist, but demanding that he: “Go home to England”. Police officers attempted to persuade two taxi drivers to take Mr Farage away from the trouble but both refused as the protesters continued to barrack the MEP with chants of “racist Nazi scum”.
...and later:
A spokesman for Radical Independence Edinburgh said: “Farage came up to Scotland to spread his racism and bigotry here – we showed he's not welcome. His party Ukip have always achieved a derisory vote in Scotland but Farage thought that could change after their recent local elections successes in England. In 2014 we finally have the chance to get rid of the political system at Westminster that pours fuel onto the bigoted fire of Farage and Ukip. Scotland wants to be a country that welcomes immigrants – but we need independence to make that desire a reality."

To be fair, the problem here isn't so much the utter lack of self-awareness involved in the witchunters when the shiny new, totally cool and awesome slogan of anti-racism amounts to 'foreigners go home.'
After all, scientists have been warning that inside the intestine of the typical liberal lurk up to seven and a half pounds of undigested bullshit, and conservatives have long known that the anti-racism industry's Average Uncle Joe's public pronouncements are to truth as A History of Banking in Manchester is to the Game of Thrones novels.
No, it's the type arguement that they're using to justify saying Englishman go home that's so spectacularly wrong from their own point of view: namely that it's his belief system, not his race, they're objecting to. He's a Nazi.

Can we use this argument so it would work in the context of actual immigration to the UK today?
Nazizm is wrong, presumably, because it encourages and indeed mandates its followers to use violence and subterfuge up to and including conquest of the entire world with the consequent subjugation of all outsiders into permanent submissive or slave status and the execution of all Jews and other undesirables. Nazism also took the stance that women were less valuable than men and ought to stick to domestic work, motherhood and religion. Oh, Nazism in practise slandered opponents, violently suppressed and eventually criminalized all political expression contrary to the will of the ruling party - there was to be no artistic, intellectual or political activity that was not condoned or compelled by the rulers, creating an intellectual police state as total as the physical tyranny on the streets and its substitution of laws equal to all for 'laws' existing solely to enforce the will of the leadership . Coincidentally, Nazi censorship started in the form of 'angry' street protests intended to intimidate and drown out the speeches of anti-Nazis.

So I'm guessing if the anti-racist, anti-Nazi Left were sincere in disliking ideologies and practises like that their next slogan would in the real world have to be; "Muslims go home. Because your beliefs and actions are wrong - not your race, which is just fine."

As a bonus, the Zen-like calm of someone who proclaims that somehow Westminster politics makes British people unwelcoming to immigrants, (as if the UK government had much to do with who comes to live here and how immigrants should be treated and how natives might feel about the situation), gives us a glimpse into the surreal landscape of contemporary liberalism's alternative reality mindset.