system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] [spoilers] A question about Far From Home's ending

Spoilers obviously. Look away if you haven't seen it yet.

Would people believe Mysterio's doctored footage? 

Even in the public's view that Mysterio was a superhero, he only had a resume that lasted maybe a week? And London was basically the only "Avengers-level" threat that he arguably dealt with, to paraphrase him. Prague and Venice got damaged, but compared to most superhero fights, the elementals didn't really do much, and he doesn't get credit for the city in Mexico since it was leveled by the time he showed up. A hero sure, but with a relatively short track record of relatively minor incidents.

Meanwhile, Spiderman has spent years building up goodwill, between the incident at DC and his work in New York. He was friends with Tony "Secular Jesus" Stark, and fought alongside him against Thanos' army. Based on the fundraiser he was at in the beginning, he's a defacto spokesperson for blip'd individuals, too. That's a guy with a mountain of public support behind him.

Would people really turn on Spiderman based on that one clip from a guy that has existed for less than a month and most of the world knows nothing about? Especially once that clip gets picked at by people with A/V specialties similar to Beck's crew?
gpt
They might once they find out Peter Parker really is Spider-Man. 

It’s a pretty classic misinformation technique — sprinkle in some genuine truths and revelations along with your bullshit, which makes the rest of your lies easier to swallow. 

As for people believing it — JJJ in this universe is clearly an intended to be something like an Alex Jones analogue. And if people can believe some of the things that come out of him...

Like it won’t be everyone, and Parker will obviously still have his supporters. But there will be that sort of conspiracy theory crowd, and getting the secret identity right might lend them some undue credibility.