This is kinda fun to watch from my position. So, the Youth have always been a fairly strong lock with Democrats. The problem is of course people get older, more experienced, and over time start trending towards the center or even outright red.
Twitter is speeding that up and I love it.
The 2020 election was the first time voting for many, the second time for some, and the third time to the far end of what's considered 'young'. So we have a spread of young people whose experience with politics is limited to Orange Man Bad and Obama Fever. They have never been truly disappointed in a candidate, and when someone gets disappointed with their current position they often self-reflect on the better past. The problem for the left that is arising is that courtesy of social media like twitter, the utter demonization of Trump isn't something the youth just forget, they know all the things he was accused of. And they were also exposed to the almost deification of Biden as the savior post-Orange Man.
And then Biden's admin does this shit. Completely fucking up the withdrawal of Afghanistan, shoving kids in cages (GOD the Democrats regret that bit of verbal warfare), spying on journalists, etc etc. The sheer level of disillusionment this causes is great. This is a core demographic, and while also the most spotty one it's by far the largest voting bloc for the Democrats. And that demographic is growing increasingly embittered.