While I may be new to this site, having yet to even finish my character app, I'm hoping what I'm about to say will not in any way count against me in the ever approaching future of my time here.
Simply put, I just couldn't ignore what was being said here as soon as I'd come across it. Something about it, and how it's being said, compelled me to respond. Especially given Ricky's response above, of submitting to another's opinion about their own writing styles and techniques.
I think the most beautiful thing about sites like this should be the freedom to express ones writing in whichever way they choose. Whether by color coding their text in one to ten different shades, italicizing thoughts or bolding their speech or, as you've chosen, writing as plainly as possible. That's what this is all really about in the end - enjoying it.
Which you, yourself, have repeated multiple times in your scrapbook is something that is very important to you. Thus, it should not be about criticizing others for not upholding the standards we've set for ourselves as writers and artists of any trait.
That isn't to say I don't understand your frustration. It, at times, can be very jarring. But even as an admin, or just another member of the site, I don't really think it's your place to call anyone out for it. In fact, it can feel very alienating or disparaging for whomever it is on the other side of your whipping words.
In the end, sites like this or the people who run them should not shame others into conformity. This is all for fun; something to enjoy while we escape the trivial pursuits of our real worlds. It should be about learning and adapting as we grow together as writers, in amazing settings such as you've created for us. At least that's my two cents on the subject. So allow others to enjoy it, however they find most suitable to them.
I think it's best that way, don't you?