I mean, a lot of people have a tendency to do “stupid” things, and maybe even say stupid things - but I wouldn’t classify 90% of the population as stupid. First problem is that “stupid” isn’t a very quantifiable quality - and “smarter” really depends on the perspective of the way you’re looking at it. I’ll use what someone else mentioned here as an example: I would like to say that I’m at least a decent software developer (or so I hope), but I know absolutely nothing about cars (I don’t even have one). While I’m pretty well rounded on the software side of computers, I’m terrible at the hardware side. I am also terrible at math aside from the very basics (and even then… eh) - hence, I’d never have a good shot at even getting into game development if that were something I wanted to pursue.

So not only can I not comment on whether other people are “stupid”, I can’t even account for myself, because there’s no metric for it. Are we going off of IQ (I have zero clue what my IQ is, nor do I really have an interest in finding out what it might be)? Are we going off of being able to answer Jeopardy questions?