do you think a person can be stupid and be aware of it?

Aware?
I made a career out of it

Yep, I am fully aware of how stupid I am.

That would make him not stupid.

not the authentic stupid ones, they are purely innocent. For good or for bad..

I know I am, even if I also think I’m smarter than I am.

Highly unlikely.
Looking honestly at ourselves is one of the hardest things we can do.

After the fact, most of the time?

No I don’t. The dumbest self aware human being is still smarter than the most intelligent self denying one.

Am a fucking moron and point it out to others all the fucking time

Probably not

I know there are thing I’m good at, and things I’m terrible at. It doesn’t take the bounce out of my stride.

Some people yes.
Some folk genuinely are too stupid to realise that they are stupid.

No idea

occasionally afterwards