This might be a hot take and you absolutely do not have to agree but for me it was social media's validation of performative activism.
Seeing the way that people in my life responded to the uprisings in 2020, followed by the genocide in Palestine, and subsequently Trump's election. Social media is the strongest tool of liberal reformist ideology because by pressing a few buttons, people can feel like they've made an impact; they are instead spreading information that may or may not be true, revealing their political/ideological standpoints to the feds and anyone caring to look, and oftentimes not caring about their immediate communities in favor of boosting international issues (not to say that's a bad thing, but as some people say, you fix your own house first -- especially in the US when your house *is* the problem.)
I already was never big on social media, as someone that was raised with open access to it, but I felt like i was drowning in a wave of carefully formatted canva infographics telling me why racism is not okay, actually.