viz.

Let's talk about searching for context.
I don't think that the post denies the fact that overweight people suffer discrimination; the question is rather can you link one form of discrimination to another without taking into account the extensive and exclusive histories of each? I think this is an important question to ask of arguments and it is an ethical obligation to mark important differences between similar and same.
I also don't think the post is "irresponsible" in "plac[ing] judgment" on the writer that commits such an act of analogy. Not only is the post about the post and not the blog, this claim indicates an understanding of the format and audience that are contradictory to the blog form/forum. The author at hand composed a public document that presented a problematic argument. She published it in a blog, rendering her argument open to an audience of readers that includes the entire web community, not simply "her regular readers."
This kind of claim really bothers me because it attempts to close down or shut off conversation about public texts in a public space. There is an implied hierarchy here about who has the right to criticize.