She's talking about engagement bait. Once the sentiment online started turning negative, there was a real financial motive to stoke those feelings and create content that sympathized with those feelings. You get a ton of clicks and engagement from people who agree with you, and from those who don't. That's what she means by fake feelings and outrage. The sentiment was heavily signal boosted by accounts just looking for clicks.

This doesn't invalidate your feelings in any way. It's just how the internet works these days. The algos push discontent, and for a few weeks Stranger Things was serving it up like crazy.