…is the 21st Century evolution of, “I’m no good at maths.”
It is a declaration that one can’t learn and so is a prime example of an Enemy of Learning.
It is said in response to a fear the person with you is judging you for not having the same knowledge they have. An Assessment that can’t be grounded.
It holds you back from asking for assistance.
The phrase holds you back for no good reason. Let it go.