The only prominent definition one could cite which includes national origin is the one used by the United Nations
Popular dictionaries (Webster/Oxford) don't include national origin
Popular dictionaries (Webster/Oxford) don't include national origin
The usage of the word "racism" to include xenophobia is common enough in a casual context that I cannot believe that you are simply not aware of that usage. By choosing to argue over the semantics of the word racism over usage you probably already are familiar with, you are diverting attention from what really matters here: that said racism or xenophobia exists and negatively affects real human beings.