you're invited so i guess you know these people, written off as hipsters or not. if it were me, i'd confront them about it. since you're more socially savvy than me i guess you might just ignore it? i don't go to parties.
on a related note, the first issue of my uni's student magazine had an article in it some white girl wrote, which might as well have been called "how to pull asian bitches (they vain, u like it.)" i think the actual title was "how to be a rice king." what gets me is that when you talk to the same kind of people about racism they're like "i hope all the racism dies with the old people."
full disclosure: i am pale as fuck.