Don't confuse Max's approach with mine - not that I am assuming you have, just a little preemptive message.
I am not saying that morals are fantasy in the sense that no one thinks that way. I agree that they are a phenomenon. However when anyone tries to claim that this or that is good or moral - iow that others should believe there is some objective morality - then that person is engaging in fantasy.
Nonsense, objective morality can be based on observational evidence.