Morality, liberty, equality, fraternity etc. aren't bad because they were created by the bourgeoisie, but rather because they stratify and restrict desire. And things that stratify and restrict desire are rather bourgeois.
I don't have a moral code, but I obviously still oppose pointless violence and child rape. I was drawing from Sartre: Since there is no god/morality, all is permitted. However, this does not guarantee freedom from consequences. We insurrectionary communists would happily bash in the skull of a child rapist, not because they violated some abstract moral-ethical code but rather because they oppressed and violated another. Why do we oppose the oppression and violation of others? Because we experience empathy, because we will it, not because of some oh-so-rational moral code. Morality is a specific system and code of what is right and wrong, a code that is rigid and context-independent. This is why we insurrectionary communists, moral nihilists, oppose it. It is inflexible, context-independent, and collective, which is contradictory to our personalized and subjective ethics.