You are a native-born American whose parents were born in Round-endia. A was delighted to receive an RA offer from Professor Blunt, unconcerned that Professor Blunt is a naturalized US citizen born of a prominent family in Blunt-endia, a country with a centuries-old enmity toward Round-endia.
As with all his research advisees, Professor Blunt regularly meets with you to discuss research. Blunt has given you good feedback on your work. By the end of the second year of grad school, you feel your research is on track.
You have begun to notice that Professor Blunt spends much time interacting informally in the lab and socially outside the lab with his several Blunt-endian students. When visiting scientists come to the lab, Blunt seems more likely to introduce his Blunt-endian students to the visitor than his non-Blunt-endian students. Professor Blunt also spends time in nontechnical "mentoring" career discussions with his other students, but discusses only technical work with you.
You feel that you are not getting as full a professional education as the Blunt-endian students with whom Professor Blunt seems more comfortable. In fact, Professor Blunt seems even more formal and impersonal in his private dealings with you than with any of his other students. You suspect this may reflect the fact that you are the only Round-endian in the group.
What, if anything, can or should you do to address your concerns?