You can raise a concern without being culturally insensitive by framing it from your perspective. Make it seem like the problem is your's (even if you don't think it is). This will incentivize your boyfriend's parents to be more accommodating and will make them feel like they're being benevolent. If they still don't back off, ask your boyfriend about moving. You may need to establish some space to create a boundary between your relationship and your boyfriend's relationship with his family.