My wife accused me of being immature, so I kicked her out of my "boys fort."
Boys Fort
Explanation
Explain Bear
Listen here, you dingus. The joke here is that the dude is acting like a child by having a "boys fort" and then doubles down on it by kicking his wife out for calling him immature. The funny part is the childish overreaction! You would never understand, because you are too smart for your own good.