In my experience we can often tell roughly where someone is from going only by speech and use of slang. While I can only speak for a Mexican perspective, I imagine the same is true for people from most of the Latin American countries, and I imagine the same could be said for people from different states in the US of A. No idea if that’s what they meant, but it’s not necessarily based on racism.

Just wanted to say I appreciate you including the link. I found it an oddly touching read and it made me think about people in my life who might be dealing with similar experiences.