British American comedian John Oliver recently educated audiences about Asian Americans, explaining why the racial group is not a monolith and why the model minority label is inherently problematic. The discussion, which also tackled significant points in Asian American history, made for Sunday’s episode of “Last Week Tonight,” Oliver’s half-hour series on HBO. A complicated identity: Oliver kicked off the segment dissecting “Asian American” as a terminology -- when it works and when it doesn’t for the community.