Ironic that Tate is a millenial. Also generations aren't like monolithic blocks of culture. The reason Tate is popular is because literally everyone is failing young disenfranchised men. Sure we get women as heroes now (good ones and very prominent bad ones ... ahem WW84)
The reason we get a backsliding is because (imo) we focus on elevating women too much. It is so so devastating for young men that just get nothing. No recognition, no support and no opportunities. Couple that with the fact that until men hit their mid to late 20s the dating power dynamic is asymmetricly shifted towards women. And you get hammered by the media "women support here, women support there" and if any young teen dares to ask "well what about us boys?" They just get shushed, that it's not their place, male privilege etc. They don't see that "privilege" everyone else speaks of. So you just get mounting aggression because no one is confirming their struggles. And eventually it ferments and turns to hate and then you can serve them whatever lies you want, if you give them the prospect of control over their life they will eat it up. And that's what Tate did. He promised them power and success.