Genuinely astonishing how this hits every cord and beat perfectly correctly. Ending the tweet with the date is such a funny move, it just jumps out at the end to wrap up the hilarious context to such a sassy tweet. And the commas which are placed to give this tweet the feel of a poem:

I would like to extend my best wishes to all,

even the haters and losers,

on this special date,

September 11th.

Every line getting a bit shorter til the great punchline.