0. https://en.wikipedia.org/wiki/Michael_Crichton#GellMannAmnes...
Stay skeptical, by all means, and don't count on the show to fact check everything for you, but why automatically dismiss them all as BS without evidence and without even hearing them out? If you found the show interesting before, you're probably missing out.
If you're actually interested in learning see UFOs: Generals, Pilots, and Government Officials Go on the Record by Leslie Kean.
There are many such books with independent accounts of those who have experienced strange phenomena, that are all consistent with each other. These books are well researched and highly sourced with credible witnesses.
I suggest you reserve judgement on what is possible or not if you haven't engaged with the available evidence.