Many of the more reasonable criticisms of the memo say that it wasn't written well enough; it could've been more considerate, it should have used better language, or better presentation. In this particular link, Scott Alexander is used as an example of better writing, and he certainly is one of the best and most persuasive modern writers I've found. However, I can not imagine ever matching his talent and output, even if I practiced for years to try and catch up.
I do not think that anyone's ability to write should disbar them from discussion. We can not expect perfection from others. Instead we should try to understand them as human beings, and interpret them with generosity and kindness.
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