Why is discordianism considered to be a big joke?

Answer 1

All the nonbelievers are just blinded by fnord.

If there could be said to be a 'point' to Discordianism, it is that the universe itself is a big joke, or at least it is better for human mental health to take it that way. Hence, being a part of the universe, how could Discordianism NOT be a big joke?

Or to put it differently - the Principia Discordia is widely available on the internet. It's a very short book, and does not have to be read linearly. Go and read it yourself.

If you find yourself agreeing with it, while agreeing also that it is a joke, you might just be a Discordian. If it strikes you as schizophrenic, drug-addled gibberish, you are probably in the clutches of Greyface. If it appears profoundly true and entirely serious, you should probably start taking your meds again.