Usually I don’t ask for a source. I don’t fault people from mistating facts, but I do try to correct them where they may be wrong. Most facts can be corroborated by some kind of source. Redactions happen as humans are fallible. It’s no reason to abandon trust in the media. Bias narratives, aside of course, are easy to spot and should be avoided. That doesn’t mean every “negative” article about a politician or political leader is bias tho.
But! When people continuously deny major news sources because they don’t always construct a narrative that’s conducive to someone’s political leader, I got to wonder where they get their source.