I've seen and read a few of your posts, and I highly doubt you are highly curious about anything I have to say. Your inquiry is merely hoping I'll post something for you to argue. In any case, you shouldn't have to be told what the mainstream media is, but here is a primer for you anyway:
https://en.wikipedia.org/wiki/Mainstream_mediaThat's more or less what's in my mind on the few occasions that I type or speak the term, and I would suspect that is in the large majority of people's minds when they see the term "mainstream media." You'll note NBC, CNN, CBS, ABC and Fox among news media outlets listed. It's not intended to be comprehensive (for example the New York Times is not mentioned), but you should be able to get the gist of it.
Most of the coverage and commentary of the BLM riots of summer 2020 would be the most recent, glaring example I can think of off the top of my head.
Coverage and commentary of "woke" culture in general over the last 5-6 years - NBC News actually has a section entitled "NBCBLK" which you would probably find great wisdom in when you felt the mood, but I encourage you to actually read it for a two weeks. If you have an objectivity at all, you may come to see that section as full of exaggerated anecdotes, and unsupported and nebulous claims using the usual buzzwords.
The New York Times entire 1619 project - would that have even been written if Hilary Clinton had won the 2016 election?
Many more.
I read largely mainstream media: mostly CNN, FOX, ABC. Also Drudge Report (which is an largely aggregation site of mainstream media), some NPR, some CSPAN, some local news (which I assume is owned by mainstream media). Very little print media anymore.
I'm sure you were hoping I'd post QANON and a few others, but I doubt I've ever even looked for them. Sorry, Mr. sanchobaile.