I think she was trying to be entertaining, and assumed that nobody would ever know exactly who she was talking about (she'd never heard of him, so perhaps didn't occur to her that internet followers *love* verifying that type of information!)
I don't doubt that there's some truth to her tweets, but the best lies are always close to the truth. I think she was exaggerating for entertaining effect, and using him as her patsy. So yes, it was rude. I read a few accounts and from what I can see there was no overt "hitting upon" anyway - as he noted in his response, they made small talk, then he watched the movie. He never asked her out or implied in any way they should get together. Her tweets make him out to be a bit of a douche, which may well be true. However, since when is it ok to publicly mock the person sitting next to you, just for your own amusement? Definitely rude IMHO, regardless of where the truth lies. She let the information be too revealing and not generic enough. If she'd kept it completely generic and not identifiable I'd be fine with it, but she basically left the guy open to public ridicule just for her own amusement.