They say x, ask for where they heard about x. They say from y news organization, ask the source for y. If they say z, if z is actually an actual document or otherwise, ask them where in z does y claim x is true.
If z is just another news organization, keep going until they provide (or don't provide) an actual document. If they can't procure an actual document, send it yourself. If z is just another video cIip, ask them for the whole video. Provide them the entire video if they can't.
Do not try to antagonize. Just simply ask the questions as if you were trying to understand their point of view, to learn something we might not have heard.
Ironic. They're the ones who have been spoonfed!
I'd say, listen, I'm engaging in critical thinking alongside with you. If you're saying you have done the hard work of examining sources, I would be shocked that you would not want to share that. However, if you're lazily swallowing whatever comes from the teats of Big News, this is exactly the type of response I'd expect. If you want, sit beside me as we dig down below the frosting and see what this cake is actually made of.