Pride in one's heritage is a positive characteristic. With the contemporary backlash by predominantly white Americans of European descent against illegal immigrants, "excessive ethnocentrism" is a flashpoint. For example, in Arizona, legislation has been passed prohibiting public school instruction that emphasizes ethnic heritage.
This behavior historically recurs whenever there is a new wave of immigrants in the United States. In the early 20th century, there was a backlash against Irish and Italian immigrants, for example.
The short answer to your question is, in my opinion, very few, if any.