Is Having Too Much Confidence Good or Bad?

Hello Steemians!

And my answer to the title is bad. Definetely bad if you are exposed to it by someone around. I believe that this is a flaw that everybody hates to see around. I work with someone who has this flaw. Since the day i started working, I have been taught some staff that i already know! Every day, my co-worker tries to teach me either some bullshit or something without any value. Today I learnt that bounty, mars and snickers are the same brand, the meaning of the word ''snack,'' that i shouldn't throw gums on the streets because animals might eat... every day he teaches me something and he sometimes questions me if i know something that everybody knows about it. One day he asked me if i knew Enrique Iglesias... the fact that he is actually very ignorant.

Maybe I should have asked another question: Is being humble good? When you are around people like him, the answer is NO. I really don't know how to deal with this situation. I keep being humble and he treats me as if i i didn't know anything. He just thinks that he knows so much stuff and very confident about it. F*cking illiterate doesn't even know how to write

What would you do in such a case? let me know and give me some advice. Should I mock him or just tell him shut the hell up?