I think he means, stupidity is not in the action, it's in you. YOU ARE STUPID.

Hey, he said it, not me.

In a partial lucid, I ran away from some angry DC's to my car. They were locked out but had a crowd around my car. I remembered that it didn't matter if I ran them over, but I found that the crowd overpowered my car. I was able to get out through some botched teleportation, but I wasn't able to focus on my goals.

Anyways, very few things you can do that are "dumb" in a dream. If you are experienced in DEILDs or WILDs, you should be able to go back into a lucid dream.

I think a bad thing would be to inflict pain on yourself when you are still inexperienced in dream control. It might be hard to get over it.

Although, that is on my long list of things to try. Pain. Horrible pain.