Also, the form that appears in the article isn't really a joke. A big part of what makes the original funny isn't just the form of the "attack" but the content itself, in particular the contrast between the formality of "disregard that" and the vulgarity of "I suck cocks". If it hadn't been so vulgar, or if it had said "ignore" instead of "disregard", it wouldn't be so funny.

Edit: Also part of what makes it funny how succinct and sudden it is. I think actually it would still be funny with "ignore" instead of "disregard", but it would be lessened a bit.