I can't speak for other people's culture. I didn't personally find it offensive. The movie is wacky and kitschy and so was the booth. I think wacky and stereotypical humor can have a place in pop culture without insinuating that it's making fun of or insulting someone in reality. Take a look at any Mel Brooks film, Indiana Jones, etc... We've got the self-named gaming wenches group here on the forums, cross play costumes in the main hall, and all other sorts. We're all accepting of each other and we all realize there's no veiled subtext inherent in any of this fun.
I'm sure we can all think of some ways it would be a legitimately racist booth, but instead we're talking about if it might possibly be offensive to someone? Yet without any takers on that side. I think it's probably alright.