Yes, when the Russian military was assembling outside of Ukraine, I was chatting with a lot of Russians on social media who were convinced (by their media) that it was just a normal drill, and that the Americans were just buying into their own government propaganda. Over the course of those conversations, Russians would say things like, "We know our media is propaganda, but you don't know that yours is just as propagandist". It was interesting that the goal of Russian propaganda wasn't to get Russians to believe that their media was infallible, but rather to get them to believe that there were no facts, that the truth was subjective, that every country's media was equally propagandist.

I saw a similar theme in right-wing American propaganda wherein American conservatives know that their media is biased, but they assume that "mainstream media" is just as bad.

It seems like in all of these cases, propagandists aren't trying to get people to believe the propaganda, but rather to discredit the entire idea of objective facts or reliable reporting.