And others disagree, the very nature of any art whether cinema or otherwise is that if even one person thinks it's art, it's art. The only case could be made is if the creator themselves didn't believe it to be art. But a third party, especially one without any input in the creation itself has no authority to objectively declare it art/cinema or not. They can only speak to whether they consider it as such, but not as a reality. And if someone disagrees with someone else calling it not cinema when they think it is then it looks like an insult, hence the controversy.