How do you measure how dim someone is?
Metrics for inclusion
Inability to grasp a basic joke.
Inability to spot irony.
Inability to sense sarcasm.
Requirement to have things explained to them that everyone else fully understands.
Find the need to explain a funny that the op made perfectly clear and the rest of the board had got already.
The inability to refrain from over egging a joke that had already long sailed.
Oblivious to all of the above.
Anything missing?