Answer:
symbolic ethnicity
Step-by-step explanation:
Symbolic ethnicity refers to the pride that an individual possesses about his ethnicity. The individual may not follow or assimilate to all the traditions and the beliefs compiled in that particular ethnicity in his day to day life. The individual takes pride even when he had adopted hardly any practice of it.
In the given excerpt, Chris' cheering for Britain and Sweden reflects symbolic ethnicity because he had hardly adopted practices and beliefs of being British but has associated with them.