Used to be no beans. The original recipe is no beans but I've started adding them to make it go further and more versatile. When I add the beans I can use it to make taco salad and chili mac. My dad also likes it with beans and he's lent me a lot of money over the years.
Beans are a personal choice, and a financial choice if you ask me. And I have seen the same ugly arguments. It's a choice, it shouldn't be a battle.
What I hate though is when people call it Chili con Carne. Carne is meat and chili is meat. It's redundant and it irritates me.