How would you describe a person who "acts like a know it all" or always has to be right?

There shouldn't be an apostrophe in "alls."

Generally they wanna be better than the next person. You know more about a certain film? - That makes you a better fan.

I thought I was wrong once..
but it turned out I was right..
So I was wrong about being wrong 🤓🕺

They display arrogant behaviors and attitudes. Have grandiose fantasies about their superior intellect, beauty, power, and success. Displays a sense of entitlement, expecting special treatment or automatic obedience from others. Feels excessive jealousy toward others and assumes that others are jealous of them.

Oh I know! But I'm not tellin'...

They suffer Trauma, that comes from being neglected...during childhood... growing up... and build themselves up trying to overcome this...and they end up being the know it all ..this needs to be recognised... , or best is to hang pout less around em :)

A joe biden

9/10 very narcissistic, it’s all about them. Over confident but often just scared of failing, argumentative and critical and full of their own self importance.

They want you to always do what they want to do. They are thoughtless. Only think of themselves. Bad friends

Egotism… narcissism…

My late father. It’s a personality trait of a narcissist.

a slick, slimy type who is lacking in education

My paternal Grandfather had a saying he told me when I was 19 in 1989, the more we learn, the more we realize the less we actually know, the knowledge of this is the key to all wisdom.