> There are no smart people or stupid people, just people being smart or being stupid.

Yeah, no. When someone is constantly being stupid they are stupid. That is what that word means. Sugar coating that is just fake positivity.

"Smart" people realize that smartness is not binary and that there all sorts of things that can influence people's smartness in a situation or on a topic other than intelligence. Very intelligent people absolutely do stupid shit. Emotions, ideology, pride, wishful thinking, laziness, arrogance, just refusing to understand something etc. can make the most intelligent people really dumb fucks.

But there absolutely are stupid people. Sometimes they have the potential to be smarter by actually using the brain capacity they have but don't use for one of the aforementioned reasons. Sometimes people are just really unintelligent; Which is fine. There is no moral failing in this. Being unintelligent but good person is perfectly okay. The real issue here is that we judge people based upon their intelligence – or rather our perception of their intelligence, which is often skewed – rather than what they do with the intelligence they have, something they can control. Nothing wrong with being unintelligent, but being purposefully stupid because it serves your point or interest is unacceptable.

In the end smartness is also an overloaded term that we project all kinds of different things into.