I think racism today is mostly about classism.
Here in Australia, the commonest form of racism I see is that of people who are uncomfortable around certain ethnic groups because of language barriers and especially because of their socio-economic backgrounds. That is, people who feel us-vs-them about other cultural groups are offended by kids who make a lot of noise, swear, and are poorly educated and seem aggressive or contrary on the whole; or annoyed by immigrants who aren't fluent in English and familiar with local etiquette, systems and rules.
Now, the same people who dislike these two groups aren't going to be as uncomfortable around someone well-educated from their own socioeconomic class, who just happens to be, say, indigenous, Asian, Arican, or what have you. Because the issue isn't really about skin colour or national origin. It's just culture difference, and classism.
I can only talk about what I've seen in my part of the world, in my (predominantly white) social groups.
But I do think classism is a major force in the modern economic world, and something we should be fighting just as hard as racism, if harder because it's an overlooked root problem. It's wrong to judge people based on the situation they were born into, just as much as it's wrong to judge them for their genetic traits.
Be aware of that socioeconomic factor. If you're uncomfortable about a broad group of people, not because of what they do but more because of who they are, that probably has something to do with it, more than racism does.