RV - Flush It Or Can It?

I know...and I agree...it's just totally gross. But...there are those...like my neighbors....that are totally afraid of that black tank pyramid... no matter how much you try to convince them that a good bit of water works wonders. I gave up...and chalk it up to their total ignorance. They also don't use the shower, the water heater, the kitchen sink, the generator, and seldom the air conditioner.
I'm like...well why didn't you just buy a tent??