A cafe in Hawaii has sparked outrage from Trump supporters after posting a sign saying that those who voted for the US President-elect may not eat there. The sign written on yellow paper and stuck to the cafe's glass door reads: "If you voted for Trump you cannot eat here! No Nazis".

The sign was reportedly put up by one of Cafe 8 1/2's co-founders, Robert Wagner. His wife and co-founder, Jali, told Fox News that the sign was not meant to be taken literally and that "Robert just wants to express how much he doesn't like Trump. We don't want to create trouble. There is enough trouble in the world."

But supporters of the incoming president have said the sign is discriminatory and called on other supporters to boycott the Honolulu establishment.

One Twitter user even compared the sign to the Jim Crow laws that enforced racial segregation in the southern states of America during the first half of the twentieth century: "Inclusiveness? You can't eat at Hawaii's 8 1/2 cafe if you voted @realDonaldTrump. Seems like old Jim Crow Dem-tactics to me."

One reviewer on Yelp wrote that they were a frequent customer to the cafe but would not be going any longer, even though "Trump was not my guy. So what if people voted for Trump, it's none of your business. By not serving Trump supporters you are no better than the bakers that refused service to the gay couple."

One former chairman of the Hawaii Republican Party told Fox News that the sign was "racist and hate-filled" and was reminiscent of days when Filipino and Japanese people were told they could not enter certain places.

Hawaii generally supports Democratic candidates with Hillary Clinton winning 62.3% of the vote in the presidential election and Donald Trump receiving just 30.1%.