I act like I don't know something all the time just so I don't have to explain it.
Why do you act like you don't know stuff?
It is just my nature, I don't like to sound like bragging
There's nothing wrong with letting other people know you're knowledgeable about something.  Being smart isn't something you should feel compelled to hide!
I will continue to hide my knowledge, who knows it might come in handy.
At the end of the day it's up to you, I just think it's fine to act smart every once in a while too.