Is it not okay for families to go out and enjoy themselves alone without friends and lovers of family members tagging along?

My grandma thinks that just because my boyfriend didn't invite me to ice skating with his family tonight, that they may be prejudice. Which is totally excluding the fact that they've invited me over to dinner and to enjoy the recent holidays with them anyway.

And while having a friend/lover/spouse whoever of a different ethnicity than one's self is never an indication of one being racist or not, his mom seems to be perfectly fine having to nieces that are mixed and is apparently someone who has instilled some form of gender and ethnic/racial equality in my boyfriend (and certainly more than other people our age generally show).

I'm sorry, but why do I need to be at his side 24/7? Especially when they're already distant as a family and probably need more time together alone, anyway. And it's not like any of their friends were invited, or his brother's girlfriend.

Ugh. I wish she'd stop saying these inane things, and I wish they'd stop irritating me every time. 
(Why don't I have an annoyed icon? I need those now, apparently.)