It doesn't reinforce your point, it makes you look like a hypocrite.

I really liked the first font from a design standpoint and found it quite readable! It's ridiculous you're being attacked for voicing a very valid concern on your own blog, because of your preferred font choice. A lot of the comments both on your blog and on here seem to almost be mocking the idea that sites should be accessible, by making an unwarranted personal attack against you, when you clearly state you were never even introduced to accessibility programming through formal education, like lots and lots of developers weren't ( myself included ).

Forcing programmers to jump through extra hoops (trying /em to learn on their own, and making well-intentioned changes but not knowing if its right or enough or effective) is not the way to increase knowledge and uptake of accessibility-minded-design as the standard.

It would be nice if designers were still able to make stylistic choices with regards to fonts and website colors, that may be less readable for some, but have it degrade easily to something more readable with a simple command or click of a button. Besides some roundabout ways i can think of, or using readability, im not sure how to do that easily though.