Unfortunately, some people run on ego and not facts or reality and are never wrong. If you've ever worked with somebody like this, it is a total nightmare, but a useful experience to make sure you never end up in the same position again. IME they never ever take responsibility for their actions it is always somebody else's or some circumstances that has caused the problem, the fault is never ever theirs. Because it is never their fault, there are no mistakes to learn from as in their mind they don't make any. We have a very good English word to describe them; fool and when they are in a position of responsibility they are normally a dangerous fool.
A piece of advice, never try to stop a fool being a fool, as you can't where they don't realise they are a fool as anybody that does will do something about it, as nobody likes being a fool.

They will obliviously set low dangerous standards for what they do and will always fail to even reach these minimums. Give them a wide berth. IME these people have very little skill or natural aptitude for the tasks they are attempting, not enough confidence to admit any mistakes so they only thing they have to fall back on is their massive egos and an African river: 'De Nile'.