Since you’re ethnically Bangladeshi, have you never had someone in the US be racist to you?
The only time a white American ever said anything negative to me was a middle school bully, and I called him a pig-nosed pink pig in response. Both of us were just looking to get a rise out of the other, so in my estimation that’s not “racism.”
The comments by the Arabs, by contrast, is based on a racial ideology. Though I don’t get worked up about it because who cares about a random interaction at the mall? The only thing I’ve ever experienced that I’d call material racism is the social exclusion by Indian people. Because that arises in professional or workplace contexts.