What was the dumbest thing you heard someone saying about crypto?

The only conversation I had was with one of my friend calling crypto a mythical currency which doesn't exist according to them. It baffles me to this day how come you can call something which has real life use cases non existent. And even arguing with them was like hitting a dead end.

Many times I've heard people calling Bitcoin a ponzi scheme. I don't get it, what do they think or see to term Crypto as ponzi?

Have you been with someone who completely ignore the fact that it exists and gave you a completely out of the world response that no one right in head would give?