This is actually slave morality: https://en.wikipedia.org/wiki/Master%E2%80%93slave_morality

According to Nietzsche, masters create morality; slaves respond to master morality with their slave morality. Unlike master morality, which is sentiment, slave morality is based on ressentiment—devaluing what the master values and what the slave does not have. As master morality originates in the strong, slave morality originates in the weak. Because slave morality is a reaction to oppression, it vilifies its oppressors