“The fool doth think he is wise, but the wise man knows himself to be a fool.”
–Wm. Shakespeare
“Ignorance more frequently begets confidence than does knowledge.”
                                                                                    —Charles Darwin  in The Descent of Man
“The Dunning–Kruger effect is a hypothetical cognitive bias stating
that people with low ability at a task overestimate their ability.”
–(Wikipedia)

“The Fool Doth Think He Is Wise”

Although his conclusion was toothsome and salty,
it was my colleague’s premise I found to be faulty.
His logic? Ramshackle, for facts in his keeping
would make a logician run, screaming and leaping,
out of the room and over the hill,
when of this insanity, he’d had his fill.

Light intellect teamed up with heavy endeavor,
expressed by a soul neither heartful nor clever
is a dangerous pairing in this Internet world,
where such like-minded fools, their illogic unfurled,
can find a wide audience, hardly deserved,
that would leave Einstein weeping and Hawking unnerved.

Prompt words are colleague, ramshackle, leaping, premise and heavy.