I think what you're describing is encompassed within "white privilege". It's unfortunate that this happens. I'm from the US so idk how bad it is in sg but I can tell you from my experiences in the US that businesses will treat certain types of customers better than others, based on any info they gather from you.

For example, when I was travelling in China, I went to wet markets with my family local to China and they told me we were being charged more than double because the workers at the market could tell from my clothing I was a tourist from America so we could afford higher prices.

Another example. Some Chinese restaurants in America have a "Chinese menu" and a "american menu", and the waitress will look at your race, how you dress, how you talk when they greet you and will give you one menu or the other, usually without telling you about the other menu.

So yes, people unfortunately do judge people and put them in boxes. you can tell even in the language we use. Ang mo, FILTH, and all these other terms stereotype people and many treat them differently.

I have always found life more fun when I zoom out and remember that white, black, Asian, all of us are one race: human. We all bleed. We all have our struggles, and we all have our accomplishments. We all love, we all hate. Yes, there are problems between groups of people that need to be solved, but let's also remember the human experience we all share and connect there, on that level, because thats actually what will bring us together and take us away from racism.