Ego is my number one pet peeve about coworkers and I have a really hard time working with anyone who won't admit they don't know everything. I have a coworker

Ego is my number one pet peeve about coworkers and I have a really hard time working with anyone who won't admit they don't know everything. I have a coworker who I can't tell that I got an answer from stackoverflow because he will instantly say "I don't care what reputation he has blah blah blah he is wrong" and won't listen to any actual research on the topic.