The act of writing in lowercase is not, in itself, funnier. But writing in the training set that is in all lowercase is _probably_ going to be the funnier writing.
Considering modern pundits online, "lowercase" is usually the case of the humourist. Lowercase also tends to be the case of sarcasm, almost exclusively deployed to be funny.
So it would make sense that models attempting to select for funny would also write in lowercase.
...this is actually a really interesting thought.
The act of writing in lowercase is not, in itself, funnier. But writing in the training set that is in all lowercase is _probably_ going to be the funnier writing.
Considering modern pundits online, "lowercase" is usually the case of the humourist. Lowercase also tends to be the case of sarcasm, almost exclusively deployed to be funny.
So it would make sense that models attempting to select for funny would also write in lowercase.