Your description sounds to me like someone was trying to explain how the US is a melting pot of cultures and they did an extremely poor job 😂

Essentially because we are a country of immigrants people with similar cultures tend to group together. For example there are parts of cities that are predominantly Italian or Chinese. Not because we are racist but because that just happens naturally. People want to share an experience a culture similar to their home country.

Obviously there is always a chance that someone will say something but just ignore them or tell them to mind their own business. You have our blessing to treat those people with absolute disrespect.