Keep coping bro the average maintenance calories from person to person has very low variance. Unless this chad in question literally towers over you, your maintenance calories is likely similar to his. The gene that triggers obesity is related to hunger, not maintenance calories. If you are obese, it's likely because you have a stronger desire to eat more food than those around you. If chads around you are seemingly consuming more food than you but yet not gaining weight, the only explanation is physical activity. There's not a mystery magical force that allows you to consume infinite calories without gaining fat. That would directly contradict the laws of thermodynamics.
If chad eats over his maintenance calories daily for a consistent period of time, he will gain a considerable amount of fat tissue. The energy needs to go somewhere, if you consume an excess amount of calories, your body will increase it's weight to compensate for the increase in calories, unless of course you exercise enough to burn the excess calories off. There is no contradicting this, this is fact. It's not obesity that's heritable, it's laziness and a lack of impulse control. I guarantee you the same people who are obese are more likely to be addicted to substances.