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.