I first read about it in the Seattle Times last year. Face Book had some things about as well but those don't exist anymore according to FB. The Washington Times, though, did have the back article where they posted what the owner said.
Oh, I've watched the video and he attacked the patrons and he is holding the pamphlet. They can be heard saying that they didn't bring it into his establishment but that doesn't change that he was offended by the pamphlet. (I think that he didn't actually read the item and probably assumed that the use of the rainbow applied to the gay rainbow use instead of the rainbow in Genesis.)
But, I don't see the activist as acting as they should either. Christians should expect people to disagree with them and should be prepared to turn their cheeks and not respond inappropriately.