You may be either very young or not an American English speaker, but the phrase "X Nazi" is American slang denoting somebody who is overly strict about whatever X is. It comes from the "Soup Nazi" episode of Seinfeld, in which a soup shop owner would evict customers from his shop with the declaration "NO SOUP FOR YOU" if they didn't follow a very precise procedure for ordering. It is not actually an accusation of Nazism.
That is why I said hyperbolic. It is still a very distasteful response, especially considering what it was replying to. I just read my post again, and I still can't find the part where I told "people what their website can or can't include for design".
You said any designer who chooses a body text font (something designers have been doing for hundreds of years, incidentally) is guilty of "self-obsessed wankery." The difference between that and telling people what they can or can't include is pretty slim.
No, I said a designer who chooses to make their website less usable for the user by forcing a download of a non-standard font (something that hasn't existed for hundreds of years, incidentally) is prioritizing their self-obsessed wankery over what is best for the user.
The difference between that and telling people what they can and can't include is absolutely massive. I am telling web designers (people whose job is to make web content accessible to users) that making content inaccessible is bad design. I am not saying "you can not be a bad designer". You are still allowed to do a bad job. And the rest of the world is allowed to point out that you are doing a bad job. Calling someone a nazi for pointing out that bad design is bad design is not constructive, or productive.