The post could have made a sane argument that the license is ambiguous and should be avoided in Free Software. But it focused on the author and made unjustifiable personal remarks. Not cool.
The author also seem to forget that there are advocates of the MIT license who would never use GPL software because of its viral nature. Does that mean Richard Stallman is 'harmful to software'? Criticize the license, but don't name-call the author who has made major positive contributions to the field.
You might argue that Crockford's contributions to Free Software outweigh the nuisance of his license, but to people who won't use his code because of the license (as you propose they do if they don't like it), his contributions are, sadly, rather worthless.
As for your last point, sure, Richard Stallman is arguably harmful to the Free Non-Copyleft Software movement, if such a thing exists. Is that a bad thing? I don't think there is a consensus in the Free Software community. Some OpenBSD folks certainly hate it...
There is a large difference here:
* The GPL is pushing an agenda in their licence, and attempts to clearly state your legal obligations.
* Crockford, on the other hand, is trying to crack a joke in a legal document. As the author states, this is dangerous to people who don't understand the legal ramifications of using this. From what I can see, the author is venting their frustration that Crockford appears to be treating the whole affair like a big joke, and I can totally understand that.