Claim: "Fun fact about Maori, in WW2 when American's came to Britain, they didn't like black colonial troops and Maori in the pubs. So they demanded the British bar them from the place, and the Brits told them to piss off and put "No White American" signs in their bars."
It's a youtube comment, but given such events as The Battle of Manners Street, Battle of Brisbane and Battle of Bamber Bridge I suspect it might be true. Is there any evidence backing that claim?
It's complete fabrication. Most likely, it's some half-remembered tidbit mixing the Battle of Manners Street and incidents of racial tension between white American and African-American servicemen in Britain.
Why this incident is implausible is the simple fact that no British black colonial troops or Maori troops were stationed in Britain during WWII. The Maori battalion, attached to the NZ 2nd Division, had arrived in Egypt in 1941 and consequently fought in North Africa, Greece, and Italy. The same applies to the African troops of the British Empire who primarily fought in the area around the Mediterranean, East Africa, or in Burma against the Japanese. Neither African troops from British colonies or the Maori battalion participated in Operation Overlord or the fighting in North-West Europe in 1944-45. They therefore had no reason to be in Britain alongside the troops preparing to invade France.
Furthermore, it's highly unlikely that African colonial troops would have been allowed to be in British pubs even if they been in Britain. Although it is impossible to completely enforce restrictions, African troops were commonly barred from going to white civilian pubs and bars. Although fraternisation between white soldiers and black soldiers did take place, measures were put in by British Military authorities and South African military authorities to make sure that no African soldier could challenge the colonial racial order. This was particularly true when it came to the idea of black men fraternising with white women or even seeing anything that could be remotely suggestive about white women. This meant that African troops were not allowed near white prostitutes, were not allowed to watch movies with biracial love scenes or with suggestive images involving white women but had to watch movies that were carefully selected for them, were not allowed to read magazines with white pin-up models, or even attend concerts that featured white women. Any and all relationships between an African soldier and white women were forbidden. Any African soldier found to be in a relationship with a white woman (who, often, was a nurse or part of the Women's Royal Army Corps) would be punished. In two cases that historian David Killingray recounts, each soldier was imprisoned for three years. Predictably, the South African military authorities enforced the most strictest segregation in which African soldiers were restricted from leaving the camp or drinking alcohol.