The most annoying trend of this is seeing Black people reacting to right wing propaganda and people in the comments saying "Herp derp. You're a freethinker."
A lot of the music ones are fake but there's a lot of genuinely good music ones too. I think the comedy ones tend to have the most realistic reactions though because, without fail, every other reaction I've seen to Patrice O Neal's or Bill Burr's comedy set had women looking uncomfortable af while still laughing.
People mostly watch videos to share the experience with someone else but a good portion of the creators cap about watching it for the first time.