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WELL A DUCK WALKS UP TO A LEMONADE STAND AND HE SAYS TO THE MAN RUNNIN GHE STAND, HEY, GOT ANY GRAPES
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'however' is one word, and is written as such. so the grammar nazi is wrong in the first place. Good job man, you try and point out a mistake that's not there.
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There aren't that many grammatical errors. The joke is still readable and understandable, and funny. A little over use of the comma and a little underuse of the full stop, but other than that there is nothing wrong with the post. Don't try to be clever, when you're not, Mr Grammar nazi. Indeed, kudos for the joke!