What is stupid? Not knowing how to do something you've never done before?
I don't know how to spin a web like a spider. If a spider can do it, am I not stupid for not being able to do it?
No, stupid is when you get taught how to do something, and you can't.
I've seen stupid. I had to train a girl how to do a job. She was earning more money than most of the people who worked in the company, but she had no idea how to do the job. So I trained her, and she couldn't do it, she cried, I gave up and told the company to get rid of her, they refused. That was also stupid.
However the coronavirus came along, and she was not there when we went back to work. Seems the coronvirus is smarter than the people I was working for.
But I see stupid on a daily basis. Or is it just selfishness? I'm not sure. Either way, most people walk around like they're better than they actually are, and do stupid things all the time.