In this era, people can fake anything, as well as debunk anything. If someone doesn't want to believe something, no amount of video will be enough to convince that person.

That said, because they're very common, and that there are many stories about them across the history (and not just in recent times) and from many different sources, and that there's a lot of government documentation, and the fact that even Pentagon officially recognized that there's something going on, should be at least enough to steer you away from saying something is just 'bs'.