I tried the analogy on my granddaughter who is almost 4. She understood it with a bit of prompting. You, I have no hope for but I'll try anyway.
In a world of moral relativism, you're flavor of morality may be different from the next guys, ie. Pol Pot and Jesus of Nazareth. That being the case there is no objective right or wrong, no moral absolutes, just moral relativism.
Is that too tough for you to handle? Should I simplify a bit more?