I respectfully disagree; we drafted soldiers to kill or be killed in Vietnam at age 19. The OP's boyfriend is 23 and old enough to balls up and resist pressure from his family if he is serious about the relationship. Moving to their own place will help, but if he still caves so easily under his family's pestering, she may have a problem. My parents were racists and didn't approve of my wife from a very different culture, and they weren't thrilled about several prior relationships (i.e., with a significantly older woman from a significantly different culture). At 23, if the OP's boyfriend can't stand by his choice of mate against familial static and cultural convention, then he should work on asserting himself.

I am a mentally ill contrarian and may have a developed a predilection for shattering expectations and conventions, so my advice on this matter may be worthless. Apologies to all involved.