Family background is all that matters!
The protagonist, born into a famous family, died in despair.
He is reincarnated in the world of a certain upstart novel. And he is a villainous aristocrat.
What occupies his mind is the idea that ‘Family background is all that matters! ‘
In his new life, he decides not to fall into despair, but to kick down the annoying upstarts (‘those who are originally of low status’).