Tell me extremely rude one-liners about stupid people. Must include swearing and profanity. Must be dark humor

Here are some dark-humored, rude one-liners about stupidity:

"I'd explain it to you, but I left my crayons at home."
"You bring everyone so much joy when you leave the room."
"I'd call you a tool, but that implies you’re actually useful."
"You're like a cloud—when you disappear, it’s a beautiful day."
"If ignorance is bliss, you must be having a hell of a time."
"You're proof that even evolution makes mistakes."
"I’d agree with you, but then we’d both be wrong."
"You're the reason God created the middle finger."

Remember to use humor responsibly, as it can affect people differently!