Ehhhhh. Dubiously canon, at best.
Now from what I recall from the EU–Legends, at least–the Empire is a xenophobic… and oddly misogynistic, though maybe that was just them correctly divining that Daala wasn’t shit… organization, who mostly fill their ranks with humans, and humans appear to be the majority inhabitants of the universe for whatever reason. So you could make an argument that human beings, as a whole, are “white” in the Star Wars universe view of race but other alien races are a metaphor for other ethnicities. The most common way for humans to be identified is by ‘world’ or nationality: Corellian, Mandalorian, etc.
Which makes sense, as entire species are shown to be enslaved–the Mon Calamari, the Wookies. Of course, we’re also shown that humans are enslaved in non-Republic space (most famously, Anakin Skywalker) but that’s pre-Empire. Maybe the Empire continues the practice of enslaving humans, maybe they end it in favor of entirely enslaving certain ‘inferior’ species of aliens. (And, of course, droids, but the Republic does that too. And clones, if you think about it.)
Of course, the problem there is that humans–both metaphorically white and also white-white–aren’t treated that well by the Empire. Luke’s family is killed. Leia’s planet is blown up, and it has at least enough white people on it that the royal family is white/Hispanic (is it widely known in the SW universe that Leia is adopted, or is she successfully able to pass as Bail Organa’s daughter? If so, possibly more evidence that the SW universe doesn’t see race as anything other than “Human, Weequay, Twi’lek”). And is it too wild to blame Han’s illegal activities on a downward job market?
Lando is treated shitty by Vader, but that seems par for the course for the Empire, not a discrimination against him based on skin color. After all, being white didn’t seem to help any of the Imperial officers that Vader executed for failing him.
Then, of course, there’s the fact that the Empire isn’t run by a populist, but by a religious minority–the Sith Lords and some would-be apprentices/acolytes, who were arguably oppressed by the Jedi, whose ‘Light Side’ worship of the Force was damned close to a state religion in the Old Republic (can you imagine the United States sending two Catholic priests to resolve a trade dispute?). For them to be comparable to the KKK or whatever, wouldn’t the Sith have to be more an entrenched, ‘old boys’ network’ sorta thing, rather than revolutionaries who have performed a very recent coup? I’d argue they’re more comparable to the USSR, especially in their abolishing of all teachings about the Force (to the point where their own officers mock and disrespect it) and ‘un-peopling’ the Jedi.
And if you’re making some kind of anti-Trump point with this, he seems way more like Borsk Fey'lya than Emperor Palpatine or any other Dark Lord of the Sith. Or maybe the Jar-Jar Binks to Putin’s Senator Palpatine.